strong wheel cleaner

I recently picked up a new spare tire for my blazer (mounts on the back). The front of the rim is nice, but the back is caked with stuff. I've tried everything I have from degreasers, cleaners, "kitchen cleaners", using them with scub pads, steel wool, etc, and hardly no change. I was wondering if you guys knew of a very strong wheel cleaner or am I just SOL? Thanks!
 
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