Paintbrush cleaner is a solvent or cleaning solution that is used to remove paint residue and clean paintbrushes. It is typically applied to the bristles of the paintbrush and then rinsed off with water to remove any remaining paint.
Paintbrush cleaner can help extend the lifespan of paintbrushes by keeping them clean, preventing paint build-up, and maintaining the shape and effectiveness of the bristles. It is available in various formulations, including oil-based and water-based options, and can be found at art supply stores.