I'm about to take my Crossfire for its first exterior detailing. When I had my last car (Mercury Cougar), the two places I had it detailed I would not return to with the Xfi because when they did a paste wax they always left a white residue in the crevices. Any suggestions for how to avoid this? - type of wax? type of service? Any favorite detail shops in the Washington DC/Maryland/Northern Virginia area? -- would love to get that "glassy" shine without the white residue in the crevices.