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Buffing pads load up with old wax and compound fast, and a clogged pad stops cutting evenly no matter how good your technique is. This citrus-based cleaner is made to strip that residue out between passes so you're always working with a pad that performs the way it did on day one.
Keep a bottle in the detailing kit and clean pads as you go instead of waiting until they're caked - it makes every polishing session more consistent.