There are some products that I use and highly recommend. This EcoSmart-RU (Ready to Use) Waterless Car Wash & Wax is a terrific product. You can wash and wax your car in no time, without damage, in one step. Check out this video:

This product is phenomenal, quick, easy and no water spots afterwards.  I highly recommend this for older cars that you don't want water from washing the car to get down into the nooks and crannies and rust from the inside out.   Go here and get yours today, you will thank me!