Matisse MM35 Brush Restorer is designed to replace dangerous, butyl-based cleaners with a powerful safe and plant based alternative. It can remove dried, built up paint from brushes without the use of harsh chemicals and dangerous fumes. MM35 Matisse Brush Restorer contains natural solvents and vegetable-derived detergents which are not hazardous to humans, animals or the ecosystem. It is free-rinsing and will not corrode brush ferrules. It is also grey water and septic tank safe, and completely biodegradable without effluent treatment processes.