I've used the clay bar on glass and chrome wheels - it works an absolute treat! On the glass, I used a blend of water and window cleaner as lubricant so to avoid smudgy residue from dish washing liquid or quick detailer. On the chrome wheels, I used dish washing liquid and water mix, clayed, then rinsed off and washed normally before applying all metal polish. Clay bar even works on your headlights too!
Clay bar works!
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