i have a victorian market barrow & want to preserve the old [poss' original] wheels,there are woodworm holes & one wheel has a small patch of rot yet they're still fairly sound & withstand being towed around the yard with no ill effect.I'd like to dip each wheel in some form of preservative whilst its still resting on the ground & am unsure what chemical to use or do i just use waste engine oil ? suggestions welcome.