Go for the mothers clay bar. Runs maybe 15 bucks for the claybar, and the spray on polish. Very simple to use, comes with the mothers wax also.

Just wash the car with mothers car wash, and dry completely. It doesn't matter if you have water spots or not because they will buff out.

Then you spray on the polish, rub the clay bar lightly on the surface, you'll feel the gritty shit coming off the surface of the car. The add the wax, and buff off. Cleaned extremely well. I used it the day I took the picture in my signature.

If need any help, let me know. I've got a buffer you can use.

You can get the kit from advanced auto.