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Purple Power is nice for softening up crud, just don't let it get on the exterior paint. You could use "Goof off" found at Lowes and other stores. It works nicely for removing tar. There's also Black Jack (I think) sold at Lowes that is used for tar removal. I used that for getting the spray on undercoating off of my wheel wells. The best thing to use is a hot water pressure washer. If you don't have one, I'd think you could rent one fairly reasonably and it would be well worth the money as you could then almost completely skip the chemicals and just melt the crud off.
Have fun.
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