Gunakan suede block (produk pembersih kulit suede berbentuk kotak) atau amril untuk mengampelas permukaan nubuck. Ampelas permukaan nubuck yang terkena kotoran. Hilangkan noda yang tersisa menggunakan sikat nubuck.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
As nubuck is created by sanding cowhide, it can withstand sanding for cleaning purposes. For the toughest stains, rub them vigorously with sandpaper or a block until the stain is removed. If you only need to clean a specific stain, only sand that particular spot. Make sure the block is clean before starting to sand the nubuck. If stains have settled in your nubuck surface, or it’s soiled all over, you’ll want to sand it completely. Run a block or sandpaper over its entire surface until the stain