The Bob Ross brush cleaning system includes: Bob Ross Odourless Thinner. This is a high-quality, odour-free thinner for oil paints. Bob Ross Odourless Thinner is very economical as it can be continually reused in your brush bath with the Bob Ross Cleaning Screen. Comes in a 1.89 litre plastic container. Bob Ross Cleaning Screen. Place this round screen in the bottom of a wide mouth container and pour in Bob Ross Odourless Thinner. Scrub brushes against the mesh to remove paint. Vinyl-coated to aid in the protection of bristles. The Cleaning Screen is 121 mm in diameter and 38 mm high. Bob Ross Brush Beater Rack. Place this rack in the bottom of a rectangular wastebasket 20" high approx. After cleaning your brushes, beat them against the Beater Rack and all splashes will be held within in the wastebasket. The Beater Rack has a vinyl-coating to protect the brushes bristles, and its dimensions are 27 cm long × 13 cm wide × 15 cm high.