A deep clean goes beyond removing loose coffee grounds. It focuses on clearing accumulated coffee oils, fine grounds and residue from the accessible parts of the brewing system. On machines with a removable brew unit, this normally involves removing the unit, thoroughly cleaning the accessible areas and cleaning the compartment around it. Always follow the cleaning method appropriate for your particular machine.

Switch the machine off and allow it to complete its shutdown before removing the brew unit according to the machine's instructions. Remove loose grounds from the brewing compartment and clean the brew unit as specified for your machine. Pay particular attention to accessible screens, channels and areas where compacted coffee can accumulate. Allow components to drain or dry as required before correctly reinstalling them.

Not unless the cleaning instructions for your particular machine specifically allow it. Some removable brew units are designed to be rinsed with water and should not be cleaned with household detergents, which can leave residues or affect lubricated components. Where a dedicated coffee-system cleaning programme or cleaning tablet is required, use the appropriate method rather than substituting household cleaning products.

Rinsing can remove loose grounds, but coffee oils can accumulate in areas that water alone may not clean effectively. Machines with an automatic coffee-system cleaning programme may use a suitable cleaning tablet to break down these deposits within the coffee path. This is different from descaling: brewer cleaning targets coffee oils and residue, while descaling targets mineral deposits in the water system.

Only if lubrication forms part of the maintenance procedure for your particular machine. Some removable brew units have moving parts and seals that require periodic lubrication, while others are not intended to be lubricated by the owner. Don't apply general-purpose oils or grease. If lubrication is required, use a suitable food-safe lubricant and follow the correct locations and intervals for the machine.

Make sure the brew unit is clean, correctly assembled and in the appropriate position for reinsertion. Check the compartment for loose coffee grounds and make sure nothing is obstructing the mechanism. Never force a brew unit back into position. If it won't fit normally, check its position and the machine's instructions rather than applying additional pressure.