I didn't seal the fiberglass on the inside of my wheel covers and now realise what a hard job it will be to clean it up for finishing, having flown for a year or so.
Has anyone got good method of doing this?
That is quite difficult. We use a combination of steam and engine degreaser (being careful with the paint) and sanding away the saturated stuff when we need to repair a wheel pant. It's never fun. I'll be curious to see what others do.