So my wax arrived today, since putting the yellow post sleeves on, they have attracted a dark film on the contact areas, the subway, before I cleaned it was absolutely filthy. There doesn't seem to be any real dirt build up, but I think it could do with a clean. I am planning on hoovering the play field first, then using something to clean, before applying the wax. I have some Isopropynol alcohol, is this too abrasive for the cleaning and should i just use novus? Followed a few of the american threadas, but they use products not available in the UK.