You can buy paint cleansers to strip wax and polish, or you could try fairy liquid, thats normally does a good job of getting rid of waxes etc.
Bear in mind if its badly swirled, then you will need a machine to remove the swirls,if its not too bad then use autoglym super resin polish, which is excellent for swirl filling, then use a decent wax, I personally use Collinite as it looks good and lasts a good few months, you could also try natty's blue,harleys,victoria etc.Collonite is £20 a tub, but will last you a good few years tho.