how to use a coin wash?

y ou have a kouki
and you actually use the brush?

I saw number 5, that you clean it real good.
but my buddy is a detailer at porsche,
and he would never use a brush on paint surfaces.

I’d understand if it was a home brush,
but one from the local wash… :confused:

you have a beautiful car,
you must be crazy to use that brush! :mad:

you havent had any issues? swurls and such ?