Interesting, how about on wheels?
If I was planning on using Ferrex first outside on the wheels (spray, let sit, no agitation, rinse off with hose)
Then I was planning on bringing the car inside for washing, would Opticlean be sufficient to clean a wheel (pre-treated with Ferrex) if used with agitation? (e.g. wheel and body brush, EZ detail brush for barrel, wheel mitt, etc)