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How to clean a varnish brush
Clean your varnish brush immediately after using it.
Cleaning your varnish brush immediately after using it will prevent any buildup in the bristles, which can cause your brush to get stiff over time. Make it a habit to clean your brush every time you use it so it can stay in good condition.
Wear rubber gloves and work in a well-ventilated room. Mineral spirits are a type of paint thinner useful for getting oil paints or varnishes out of brushes.