Stain removal are capable of removing: Household bleach generally removes a stain's colour, without dissolving the stain itself. Hydrogen peroxide is also a bleaching agent that can be used to treat stains. Sodium hydrosulphite and sodium hypochlorite normally used for removing stain and dyes colors. Acetone is good for removing some glues, nail polish, ink stains, rubber cement, and grease. Nail polish remover may contain acetone, however for general use it is best to obtain bottled acetone from a hardware store. It can be diluted with water. Inert solvents are those that do not react with anything in the stain. Water for
Nail biting disorder (21%). It is also more common among children and adolescents with obsessive–compulsive disorder. Nail biting appeared in a study to be more common in men with eating disorders than in those without them. The most common treatment, which is cheap and widely available, is to apply a clear, bitter-tasting nail polish to the nails. Normally denatonium benzoate is used, the most bitter chemical compound known. The bitter flavor discourages the nail-biting habit. Behavioral therapy is beneficial when simpler measures are not effective. Habit Reversal Training (HRT), which seeks to unlearn the habit of nail biting and possibly replace it