A special cleaning formula that easily removes the toughest dirt such as brake dust, oil, and other road dirt * sticks very well to the rim surface, ensuring permanent cleaning * cleans automatically * the indicator turns red after the cleaner works * * suitable for all steel and aluminum rims. Product features: ✅ guaranteed acid-free. ✅ suitable for all steel and aluminum rims. guaranteed acid-free. suitable for all steel and aluminum rims