Jasart Byron Ultimate Brush Cleaner 250ml. Jasart Byron Ultimate Brush Cleaner revitalises your favourite synthetic or natural brushes in a few simple steps. Breakthrough hardened acrylic, oil and lacquer to bring your brushes back to life. Simply remove any excess paint from the brushes, cover the brush liberally with the Ultimate Brush Cleaner making sure the bristles are fully coated and then massage the cleaner into the bristles. Once satisfied with the result, rinse the bristles with water until the cleaner has been removed. The time to clean depends on the brush's condition. Allow your brush to dry. Available in 250ml & 1L, each sold separately.