Clear business, water should be changed as contaminants. By the way, instead of simple warm water, you can safely use a soap-pile solution. The consistency of the preparation of the product — five tablespoons of soap and soda for ten liters of water. Want to take white more efficiently? Then use the Clayster. It can be boiled from flour or starch. In any case, the water is brought to a boil, after which an adhesive is added to it and stirred to a liquid test -shaped consistency. After filtering to the mixture, you can add a little PVA.