Why not?My dad has been in the carwah buisness for 15 years. If you want the absolute best wash go to a high quality hand wash and go through the presoak, soap, rinse cycle. If the car apears clean then resoap and use a micro fiber mit to wash over the car to get any coats over the car that high pressure won't take off. Than rinse and SPOT FREE RINSE. Than use a shammy and let it drag over the car without putting pressure on it. Once the main water streats are off air dry it on the high way.
This is good to do on a couple week basis. Youll still have to do deeper cleans and wax but this will help sustain the life of the car alot. BTW, I would not suggest using the liquid wax in carwashes. There are many readons for this but I would just not advise it.