Mr Sheen is full of silicon too.
You can never reprint a car that has been polished with Mr Sheen (and we used to use it to polish motorcycles in the shop I worked at.
Plexus can be found in most major motorcycle shops.
I'll also give a vote to Auto Glyms red microfiber cleaning cloth. I have had one for years and use it on everything. I must make a specific exception as regards to canopy plexiglass though.