This brush cleaner and restorer is indicated for modelers who want to maintain or restore their brushes to likenew condition. It does not contain solvents or alcohols that can damage the hair of synthetic or natural brushes. It is recommended to soak the tip of the brush in this liquid for 24 hours for deep cleaning and restoration, and repeat the process if necessary with very damaged brushes (*the tip should be suspended without touching the bottom of the container so that it does not take shape). This product will extend the life of your brushes more than any other cleaner.