Hi RobertI was given some really good advice by a company selling fibreglass and resin with all the stuff that goes with it, and they gave me a brilliant method Which was to coat the plug with cantstik waxand to buff iy up to an immaculate shine, having done that, apply another layer of wax and buff that up to a brilliant shine. Repeat this action up to twelve times when you will have a deep deep shine to which, nothing can stick, hence the title Cantstik, it works like a dream for me