Description Use with hot water to bleach unfinished or stripped wood quickly and easily. Use on all unfinished woodwork, floors, doors and etc. to lighten wood or match different wood colors. Use to remove black water spots and tannin stains in wood. Can be used to remove rust stains on stucco & wood Wood bleach contains oxalic acid which, when mixed with hot water, effectively bleaches unfinished or stripped wood quickly and easily Wood bleach is excellent for removing black water spots and tannin stains in wood caused by irrigation systems.