ACF leave a film, it is not water soluble so you need to use a solvent based cleaner to get it off each year before re-applying it.
FWIW it is top stuff, I put it on the GS last October when I bought it and road through the worst that the winter could throw. Contrary to popular belief BMWs are not great at resisting corrosion, ok not as bad as suzukis but bad enough. The GS stood up very well indeed.
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