Derivan Artist Brush Restorer is designed to remove dried, built-up paint from brushes without the use of harsh chemicals. Buy online and bring your old hard paintbrushes back to life. Derivan Artist Brush Restorer has been 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. Derivan 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 greywater and septic tank safe, and completely biodegradable without effluent treatment processes.