Wear rubber gloves while cleaning brushes with turpentine or mineral spirits. Pay special attention to the area around the brush's ferrule. A build-up of pigment in this area will make it difficult to reshape your brushes. Massage the brushes in the palm of your hand using liquid dishwashing detergent and warm water. Rinse and repeat until a rich lather develops.
Rinse bristles a final time.
Gently squeeze out any surplus water and reshape the brush to its original shape. Lay brush flat to dry or store, bristle-up in a jar. Wipe your palette and painting knives and palettes clean with mineral spirits or baby oil and clean rags. Do not scrape or scrub with abrasive cleaners. Remove paint from your hands with baby oil and then soap and water.