Wash out stains, especially from dark liquids and substances immediately with water. Use commercial, non-abrasive household cleaners if necessary. If possible, clean stains before they can dry. Stain residues, in particular grease and grime can be removed with a 30% solution of soft soap and hot water and a washing-up brush or a nailbrush. Repeat until the stain has been fully removed. You can use cleaners with max. 15-20% alcohol content to remove stubborn stains, e.g. Sidolin or Ajax glass cleaners.
Remove any soap residues with warm water and rub dry with clean chamois leather.
Before using a commercial household cleaner, be careful not to use unthinned or concentrated coloured cleaners as the colorants contained in these cleaners can leave colorant residues on the finish. It may not be possible to fully remove dried in stains or substances that have been allowed to penetrate the finish over a prolonged period of time.
Warning:
This type of finish is not resistant to organic solvents such as thinners, nail polish removers (acetone) or concentrated alcohol spirits.