I wouldn`t be so sure, we`ve gone through some exercises here or at AGO which indicate Dawn simply "clogs" the sealant with its surfactants. I would just wash the car, and apply your new sealant, if it gives you the results you want, great. If you don`t want to do that, an IPA wipe is going to be more effective than Dawn, and I believe in the previous testing that I referred to, actually removed the Dawn and restored the beading.
Here, I found the relevant threads:
LSP stripping
Sealant Test: PowerLock (+/-) BlackHole, Wolfgang DGPS, & BlackFire WD
So--since all this time we think we`ve actually been stripping sealants, when in fact they are still there with yet another layer of crap on them, and then we "wax" over the top of that, I`d just not worry too much about it.
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