Neurobit
RAM Sorcerer
Brian,I've never used Adam's VRT but it but says that it is water-based, no solvents or alcohol, and silica-infused.
Looks like BAK recommends 303:
Tonneau Cover Care and Maintenance | BAK Industries | BAK
Learn how to properly care for and maintain your BAK Industries tonneau cover.bakindustries.com
I’ve read nothing but good reviews about VRT, so you can’t go wrong with either one.