Weber : Turpenoid Natural : Brush Cleaner : 946ml Turpenoid Natural is an extremely effective non-toxic brush cleaner and gentle brush conditioner which rinses out with plain water. It is non-flammable, non-irritant and does not emit harmful vapours. It is an effective painting medium when used within recommended guidelines. Reviews of Turpenoid Natural as a brush cleaner have been outstanding. It cleans even dried brushes. Although it can be used as a medium for mixing with your oil paints most reviewers of the product recommend against it because the paintings take a very long time to dry and you must be careful not to use very much medium.