For interior and exterior detailing, nothing beats these Boar's Hair Brushes for quick, safe, scratch free cleaning. The round brush seems best for out-of-the-way crevices and really helps out interiors. I use the "flat" ones to detail oily door jams and exterior trim where wax tends to accumulate. The boar's hair is epoxy-set in nice wooden handles. Safe for the most delicate interior surfaces.