Dry the car with an electric blower. The less number of times the paint is touched, the less chance there will be to scratch it. Safer than rubbing with any towel. Sears has a 220mph house brand or the Toro 215mph for about $60.
You can also put the Zymol over the paint protectant. Even add a couple of coats to make it last longer.
Another product that got great reviews for ease of use, shine and longevity it Rejex. Put it on about every couple of months(garaged car) with wash/QD in between and your good to go.
2004 E60 530is, Delivered 12/12/03, TiSilver/LGrey, PP, SP,PS, PDC, ACC, FRS, Step, Xenons, clear bra, body colored rear inserts. (Retired, 1983 henna red 320is)
2004 Corvette Z06 Commemorative Edition