TR - TAwill clean painted and non-painted trailer panels. TR - TA may be used on wheels, tanks, and other hard to clean areas of trailers for the transportation industry. TR-TA may be used on concrete trucks to remove the white haze that develops from cement dust over time on the barrel and truck. When used properly will not harm paints. TR - TA may be used to brighten aluminum and aluminum trim on trailers. TR - TA will help remove rust on steel hinges and wheels or other areas where rust may occur. This product will etch glass so care should be taken to keep off mirrors and windows.