A strong taste of bitterness or rancid fat in espresso indicates that the internal channels of your coffee machine are clogged with oxidized coffee residues. It is the accumulation of the lipid fraction of grains on the walls of the brewing unit and the hydraulic system that is the main reason for the deterioration of the taste characteristics of the drink, even when premium raw materials are used. Ignoring this problem leads to the fact that old scale and greasy film begin to interrupt the natural aroma of fresh roasting, making every sip unpleasant.
The process of removing these deposits requires not just washing with water, but the use of specialized chemical reagents that can break down fats. Coffee oils, settling on metal and plastic surfaces, polymerize over time and turn into a hard coating that cannot be washed off with regular rinsing. Therefore, regular decalcification and dry cleaning are mandatory procedures to maintain performance. DeLonghi, Saeco or Bosch.
Depending on the intensity of equipment use, the frequency of deep cleaning may vary, but it cannot be completely excluded. Modern automatic models are often equipped with indicators that indicate the need for maintenance, but you should not rely on electronics alone. Visual control of the quality of the foam and the taste of the drink remains the most reliable diagnostic tool for the owner of the device.
Causes of plaque formation and its impact on technology
The main source of the problem is the coffee beans themselves, which contain from 10 to 20% oils, depending on the variety and degree of roasting. When hot water comes into contact with ground coffee under high pressure, these lipids are released and deposited on all surfaces that the drink comes into contact with. This process occurs especially actively in brewing unit, where temperature and pressure are maximum.
Over time, a thin film of fat oxidizes in air, acquiring a characteristic rancid odor and changing its chemical composition. This oxidized layer begins to interact with new portions of coffee, imparting unpleasant flavors to the drink that cannot be masked by milk or sugar. In addition, the sticky base promotes faster formation scale and traps small particles of coffee dust.
⚠️ Attention: Using low-quality water with a high content of hardness salts accelerates the hardening of coffee oils, creating a composite coating that is extremely difficult to remove without special means.
If regular maintenance is not carried out, the layer of deposits becomes so thick that it begins to mechanically interfere with the movement of parts of the brewing mechanism. Pistons and seals lose elasticity, and the flow area of the tubes decreases, which leads to a drop in pressure in the system. As a result, the coffee machine begins to work under overload, which reduces its service life pumps and heating element.
Necessary cleaning products and tools
To effectively remove fat deposits, ordinary water or household dishwashing detergents are absolutely not suitable, as they form abundant foam, which is almost impossible to completely wash out of the hydraulic system. You will need special coffee machine cleaning tablets or liquid cleaners designed specifically to dissolve coffee oils. Such products usually contain alkaline components that are safe for plastic and metal and break down organic matter.
In addition to chemicals, you need to prepare a container for draining waste water and a soft rag for wiping external elements. If your model allows you to remove the brewing unit, as is done in machines DeLonghi or Krups, then you will also need a brush with soft bristles for mechanical cleaning of hard-to-reach places. For automatic systems with a fixed block, a flushing mode is critical.
- 🧼 Specialized cleaning tablets or liquid for removing coffee oils.
- 💧 Distilled or filtered water for preparing the solution and final rinsing.
- 🧽 Soft brush and microfiber for caring for the brewing unit.
- 🧤 Latex gloves to protect the skin of your hands from chemical reagents.
When choosing a chemical, pay attention to compatibility with your model, although most universal cleaners are suitable for all brands. Do not use vinegar or citric acid to remove oils, as their purpose is to combat scale (calcium), not organic fats. Mixing different types of chemicals can lead to unpredictable reactions and damage to seals.
For best results, use warm water (around 40-50°C) when preparing the cleaning solution, as this will speed up the dissolution of the tablet and increase the efficiency of the reaction.
Preparing the coffee machine for cleaning
Before starting the active cleaning phase, it is necessary to properly prepare the device to avoid breakdowns and ensure maximum efficiency of the process. The first step should always be to remove any remaining coffee from the hopper and empty the grounds container. This will prevent fresh grain from getting into the cleaning solution and allow the system to run idle.
Next, you should remove the brewing unit if the design of your coffee machine Saeco, Philips or similar provides for this possibility. Visually inspect the assembly for large pieces of cake or obvious contamination that can be removed mechanically. If the block is non-removable, as in most models Nespresso or Jura, make sure the door is tightly closed and the system is ready for automatic flushing.
It is important to check the water level in the reservoir and, if necessary, add fresh fluid to the minimum level so that the pump does not run dry. Some models require switching to service mode or selecting a special program through the menu Settings -> Maintenance. Carefully read the instructions for your device, as the sequence of actions may vary.
Step-by-step instructions: dry cleaning the system
The oil removal process starts after the cleaning agent is dissolved in water. Place a tablet in the reservoir or pour in the recommended amount of liquid cleaner, then add water to the desired level. Start the cleaning program and the machine will begin to drive an aggressive solution through all internal channels, the boiler and the brewing unit.
During the cycle, the machine may pause several times to give the chemical time to work on the deposits. At this point, a fat neutralization reaction occurs, and you may notice a change in the color of the exiting liquid to dark brown or brown. This is a normal process, indicating that the cleaner is working and flushing out accumulated dirt.
☑️ Cleaning checklist
After completing the main cycle, it is necessary to thoroughly rinse the system with clean water to remove any remaining chemicals. To do this, fill the tank with fresh water and run the rinse mode or prepare a few cups of hot water without coffee. Repeat this procedure twice to make sure there is no alkaline solution left in the pipes that could ruin the taste of your next drink.
If you are cleaning the detachable infuser separately, soak it in a warm cleaning solution for 15-20 minutes. After soaking, gently brush the mesh and moving parts with a brush, washing away the softened plaque. Do not use abrasive pads, which can scratch the plastic and create micropores for future contamination.
Mechanical cleaning of the brewing unit and components
Dry cleaning is effective for the internal channels, but the external parts of the brewing mechanism require manual intervention. After removing the block and soaking it, inspect the rubber seals and moving rods. This is where thick coffee gruel most often accumulates, which interferes with the free movement of parts.
Clean under running warm water using a soft brush. Pay special attention to the mesh filter through which the water passes: its cells must be completely free of plaque. If the mesh is clogged, the pressure in the system drops and the coffee turns out watery, even if the grind is correct.
| element | Type of pollution | Cleaning method | Frequency |
|---|---|---|---|
| Brewing unit | Coffee oils, cake | Soaking, brush | Once every 2 weeks |
| Cappuccino maker | Frozen milk, fat | Steam blowing, brush | Daily |
| Bean dispenser | Dust, oil film | Dry clean, brush | Once a month |
| Pallet | Liquid, coffee residue | Washing with detergent | Daily |
After washing, be sure to let all parts dry at room temperature before reassembling. Do not use a hair dryer or other heating devices, as sudden temperature changes can deform the plastic elements. Reassemble only after complete drying to avoid the formation of mold inside the mechanism.
Caring for your cappuccino maker and steam wand
The cappuccino maker is the unit that gets dirty most quickly due to the presence of milk fat, which turns to stone when heated. If you use an automatic or manual cappuccino maker, it must be rinsed immediately after each preparation of a milk drink. Turn on the steam for a few seconds to clear out any remaining milk from the tube.
It is recommended to deep clean the steam wand once a week. To do this, lower the end of the tube into a container of water and turn on the steam so that the water passes through the system and washes away contaminants. If the tube has a removable cap, remove it and soak it in a cleaning solution along with the infuser.
⚠️ Attention: Never leave milk in the cappuccino maker system overnight. Solidified milk is almost impossible to remove without disassembling the unit and can become a source of bacteria.
For automatic systems with function LatteGo or similar, follow the instructions for disassembling the milk circuit. Often such systems require flushing with a special solution for milk lines, which destroys fat film and bacteria. Ignoring this step results in a sour odor in milk drinks.
The secret of perfect foam
The cleanliness of the cappuccino maker affects the texture of the froth more than the brand of milk. Clogged vents create uneven steam flow, which prevents the milk from emulsifying properly.
Maintenance Frequency and Prevention
The regularity of cleaning directly depends on the volume of coffee consumed and the hardness of the water used. In an office environment where the coffee machine is constantly running, dry cleaning should be done every 200-300 cups or once a month. For home use, it is enough to perform the procedure once every 2-3 months or according to a signal from the device.
Using water filters such as Brita or original cartridges from coffee machine manufacturers, significantly reduces the rate of scale formation and reduces the amount of dissolved salts that bind to coffee oils. This extends the intervals between services and improves the taste of the drink. Change filters strictly after their service life indicated on the packaging.
Do not wait until the machine itself asks for cleaning or starts producing errors. Preventive cleaning takes less time and costs less than repairing hydraulics or replacing the brewing unit. Keep a maintenance log so you can track the dates of your most recent procedures so you don't miss them.
Timely cleaning of the coffee machine from oils extends the service life of the device by 2 times and guarantees consistently tasty coffee every day.
Monitor the condition of your coffee beans: if you use heavily over-roasted beans with a visible oily sheen on the surface, you will have to clean the machine more often. Such grains release more oils, which quickly clog the system. Try to choose medium roast beans for daily use in automatic machines.
Can citric acid be used to remove oils?
No, citric acid is only for removing scale (calcium deposits). It does not dissolve coffee fats and oils. To remove oils, alkaline products are needed.
How often should I clean the brewing unit manually?
It is recommended to remove and wash the brewing unit with warm water without chemicals once every 1-2 weeks, and carry out deep cleaning with tablets once every 1-3 months, depending on the load.
What should I do if there is a chemical taste left after cleaning?
Additional rinsing of the system is necessary. Run 2-3 full tanks of clean water through the machine in the hot water mode without coffee.
Is frequent use of cleaning tablets harmful to my car?
If the dosage and manufacturer's instructions are followed, the special tablets are safe for all materials in the coffee machine. They are designed specifically for regular maintenance.