I've GEPC, AIO, SG, and have a good coat of P21S on the wife's silver Murano. I'm using P21S body shampoo to clean. How many times can I wash this four door hotrod before I have to re-P21S? I know that I should be able to tell by the way the water breaks but with the AIO and SG applied in the equation, I'm not so sure I'll be able to tell. :nixweiss