My alloys have recently took a battering from brake dust. I never previously had to do much more than scrub them with a brush. I think the garage must have cleaned my alloys with a scouring pad and removed the laquer

I used some Maguirs Hot Wheels to clean them, which seemed to do a relatively good job, but then I put some RimWax on it started to "polish-finish" them !
Long and short of it, is there a sealant you can use if the laquer's been removed?