When mixing powdered oxygen bleach with water, use warm water to ensure that all of the powder dissolves, then add cold water if needed. Completely submerge the stained garment and allow to soak for as long as possible - up to eight hours or overnight. Oxygen bleach works more slowly than the harsher chlorine bleach and patience will give you great results.
Oxygen bleach is most effective when used in a powdered formula that is activated when mixed with water. Liquid versions of oxygen bleach can lose their effectiveness with age. If adding powdered oxygen bleach to wash loads, add the powder to the empty washer tub first, then add clothes.
At the very least, maintenance involves periodic cleaning. You can clean some things with regular liquid dish soap and water. Tougher stains from barbecue grills, tree sap, mold, mildew and algae may need more powerful powdered oxygen bleach you mix with water.
I’ve had the best luck cleaning teak wood when it’s dry. Try to work in the shade, if possible. Mix one cup of powdered oxygen bleach for each gallon of hot tap water. This will cut through dirt, algae, mold, mildew and most of the oxidized wood stains or sealers that might be on the teak.