Zaino clay is fine. Just keep it lubed. Use their Z-7 carwash for lube, they give the instructions.
I am a Zaino whore to be sure. Z-7 is fantastic stuff.
'11 550i, but it's too big for me
Prev: '08 E92 M3, '04 E46 M3
Completed production: 2015 F80 M3 SO/SO MT, pickup at Welt 7/1/2014