Why not use sulfuric or fluorhydric with, in addition, sand paper plus a chisel and a hammer ????????? HCl etches the aluminum. Don't use it at all, even in a very diluted solution. If your rims are bolted, the risk is not negligeable because the acid might remain within the small intervals or below the bolt heads. It will ruin slowly and slyly the metal the rims are made of.
Dedicated cleaners, recommended by BMW wouldn't hurt your rims as far you are quick enough. The rest of the job being done with elbow grease !
I never used such agents on my Z3 rims. They're 5-year old. No deposit, no dust. A regular washing with the BMW Wash'n Wax plus a quarterly waxing perfectly did the job.
Now you're aware of the old wives' remedies. It's up to you to prefer playing Russian roulette !
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