Liquid glass question

I recently met a fellow rver that had a beautiful 2006 motorhome. After talking to him I found out that he used a product called liquid glass. It is available at auto zone . I read the directions and it states that it is very important to remove all wax before applying liquid glass.

Has anyone used this product and what did you think? Also how did you remove all the wax? Not sure if I am going to try this product but it does look interesting. Any information would be appreciated.

Thanks

Ken