With the use of newspaper, remove as much paint from the brush as possible. Then, soak it in water (if water-based paints were used), in NITRO CELLULOSE THINNER or another diluent best suited for the paint used, until the hair unsticks.
If necessary, brush the hair brush with a wire brush so as to remove traces of hardened paint. Wash it out with hot water and a little detergent, and rinse it out with running water. Finally, squeeze and smooth out the hair. Keep the brushes in a horizontal position, never leaving them lying on the hairs.
If, when you pick up a brush, the hairs are hardened, let the brush soak in thinner so as to soften.
After using the roller, use a newspaper to remove the excess paint. Remove the cylinder and soak it in water or CELLULOSE THINNER (or another diluent, depending on the type of paint used). Rub the hair with a detergent (Washing up liquid or an all-purpose cleaning product) and hot water, dry it out and replace the cylinder in the support bracket.
Keep these in a dry, slightly warm place, out of the reach of children. To avoid the formation of surface film, ensure that the lid is tightly closed, turn the can upside down and keep it in this position. When you reopen it, the film will be at the bottom and the paint will be fresh and ready to use on top.
Wash the trays, buckets and grids with an appropriate diluent after cleaning most of the paint residues with absorbent paper.
A LITTLE TRICK
An old paint with lumps can be filtered with a pair of nylon stockings stretched over a suitable container.