I use Pledge on my bike, my helmet, and the shield on my helmet. It is VERY safe. Also leaves the surface a bit oily so bugs and grime do not stick.
That said, I have S100 (similar to Plexus) in my sidebag, and it works better than Pledge. Also a ton more spensive.
Tail of the Dragon at Deal's Gap... Avoid it now, do a trackday.
Do not do business with Myrtle West Cycle... Not a reputable vendor by a long shot.