FEX Iron Remover is a product that dissolves even the most stubborn iron contaminants. Removes brake dust and any iron deposits from automotive surfaces and wheels. As it starts working our formula will change from clear to purple, and in seconds you will notice the dissolving action. The FEX Formula is quick, rinses easily, and does not require any agitation. The Non-caustic formula will not burn or corrode and can be used on most surfaces including RVs, trucks, automobile OEM painted surfaces, coated wheels, and glass.