I'd say yes, used on some caked wheels of my UP GTI on Friday. Need to let it work, may take a few sessions.
Post revival so apologies. My alloys are coated in gtechniq c5 but I've still got loads of fallout even after doing them twice with gtechnic fallout remover. Any suggestions on what else to use to get the fallout off? Would a claybar work or am I better off trying a different fallout remover?