Always make sure that you unplug the tumble dryer from the mains before you start any maintenance.
Warning: Do not use Abrasive cleaners, sharp instruments, soap, household cleaner, detergent or flammable fluids. They may damage the tumble dryer and may cause a fire.
Clean the outside of the tumble dryer with soapy water or non-corrosive detergents, then wipe dry with a soft non-abrasive cloth.
Wipe the door seal and drum with a damp cloth ideally after every drying cycle.
Leave the door open to let the door seal and drum dry thoroughly.