Apply the product undiluted to the soiling using a sponge or cloth. Allow the product to penetrate briefly (do not allow to dry) and then wipe off with a clean sponge or cloth. Caution: Before use, test the surface on a less visible place for resistance. In case of stickers, we also recommend removing the sticker as far as possible (by hand) beforehand. For persistent stickers, first loosen a corner. Then apply the product to the sticker or glue residue with a sponge or cloth. Allow the product to work in briefly, after which you can remove the sticker residue. Repetition may be necessary for stubborn adhesive layers. When applied in closed rooms, ensure good ventilation.