I've had decent results by;
Soaking the bolts & nuts in parts cleaner for a few hours.
Taking my Dremel & wire wheel to clean the threads.
They are not bright & shiney like new ones but are very usable. On some I use ' School Bus Yellow'. From ace hardware. Or epoxy almond for the white. It all depends how exposed they are? My cubs are NOT museum things. They work & my only concern is to spiffy them up a bit.
On some of the nuts I do re--thread them if they are screwed up.
NIK,
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It dont cut grass, but its yellow.
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