Myself.. my alum bits never touch steel or iron..
if I clog a alum bit I stop and let it cool and spray
it then pop the alum out of the bit.. they will load
up with heat... also I dont use my steel bits on alum..
if I want it a bit smoother I will hit it with tootsie
rolls.. but not fine ones.. unless its the exhaust side..
I like the exhaust side SMOOTH
wave