2 and Burton -

Thanks for the tips. I tried some of the vinegar and immediately followed it up with a clay bar and it did a pretty good job. I then used a cleaner wax followed up by your typical carnuba wax and all seems to be well. Obviously I did the clay and 2 waxes on the whole thing and not just the spot, so that made for a long day for me. My X is back to not being a nasty mustardy mess anymore. Thanks!