As a professional decorator I will tell you what we do. Contry to what I have read we don't throw them. Cost implications. Scrape out the excess paint from the roller using a clean scraper. then Wash out in cold water. With oil based paint brushes buy a "brush keep" this enables you to keep your brushes in paint without having to clean them in turps. - inside the brush keep is a section where a piece of card is soaked in solvent, the fumes keep the bristles moist. an excellent invention!!!!