As a first step, do you want to use a pre-wax cleaner first, or will a clay bar do the job?
Second, how long should a claybar job take? Last year I started using one, then got tired after the hood and one fender, gave up, used a prewax cleaner then put on a new coat of wax. Also, this may be a dumb question for some of you, but when using claybar, do you want to go in one horozontal motion or in a circular, and use long or short strokes/circles?