What kind of wax are you using and are you doing this in sunlight, shade or what? My car is black too and its hard to keep clean, so I know what you are talking about. I use two buckets to wash mine, one with soap and the other with clean water. I use the Absorber to dry with as it is pretty good to dry with and not make swirls. Anyways, you never go from the car back to your soap bucket, you rinse in the water, then get more soap. Never do anything in circles, especially on a black car, you can make swirls even with the best non-scratching thing like a lamb's fleece mit. To detail my car I do a polish, glaze and wax job. You don't have to do this everytime you wash, but it really helps your car look its best, so about every two months or so. When you wash in between though, just remember to use a car wash that does not strip the wax, so dish detergent is out, actually it should be out anyways. Some other tips, never do anything in circles on a black car, go in vertical strokes whatever you are doing. To get more info, there are many great detailing sites on the net and the pros are usually more than willing to talk to you about your detailing questions.