The e15 maintenance kit helps remove stains and conduct minor repairs. For stains, which are not removed with a dry cloth, use a damp cloth by wiping over the effected surface. Every treatment should be in the direction of the wood’s grain. Water marks are best treated with a damp cloth. The same goes for grease stains, first try using a damp cloth, if necessary then wipe with a mild soap sud. For deeper remaining stains, it might be necessary to sand the area (gritty sponge or sandpaper, grain 150), always sanding in the same direction of the wood’s grain. For sanding, the wood needs to be completely dry. Afterwards, use a cloth from the e15 maintenance kit with some oil and apply evenly on the whole surface. Please allow oil to soak in for at least half a day before you wipe off excess oil.