Re: oracle 651 or 751? RapidPrep any vehicle that you do to remove wax and road grime/oxidation build-up. You want the decals to adhere to the paint/glass, not the wax.
Personally, I wouldn't use 651 for anything. 751 is fine for window decals, but more often than not I'll use 851 and spare myself the headaches. The price difference is negligible when you break it down over many jobs.
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