Though I painted my larger engine covers, I've polished many of my other engine parts as well as the brake backing plates and lower fork legs, and I left them as is - clear coat detracts from the shine a bit and may eventually yellow as Honda's clear did over the long haul. I haven't had to re-polish anything of mine since doing it 2 years ago, though it is stored inside
For polished parts I use Mothers and just keep the parts clean with a clean dry rag. If they start to get cloudy I give them a real quick rub with more Mothers. Seems to work for me and I hardly ever have to reapply polish. I've been working out of the same tin of polish for 3-4 years now if that's any indication of how little maintenance they need and I ride all seasons rain or shine (when craps not broken).
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