The strongest P21S of all times - top material protection - pH skin neutral. Cleans even the most stubborn dirt such as extreme brake abrasion, oil and rubber residues as well as any road dirt automatically and quickly. Guaranteed to be gentle on all materials and therefore absolutely safe to use. Even in cold weather, uncompromisingly powerful cleaning performance with short contact time (only 3 - 5 min.). Thanks to the special gel formula, the cleaner remains on the rim surface for a long time, does not run off and can thus actively loosen the dirt. The active indicator shows visually (violet to black discolouration) that the dirt is dissolved from the surface by the active cleaning components. Biodegradable. Suitable for TPMS (tyre pressure monitoring systems).