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Does the listing mention anything about service records? That would be crucial for me before committing to this purchase. Also, have you checked the title history to make sure there are no issues? Sometimes Bring a Trailer listings don't include all the details you need.

Compressed air works best in my experience. I got a small air compressor just for cleaning parts and it's been a game changer. The white powder comes right off without any risk of scratching the finish.

Isopropyl alcohol should work fine. It evaporates quickly and won't leave residue. Just make sure the parts are dry before installation to avoid any moisture-related issues.