A Micro-Fibre applicator, something that has a little more bite to work the product than using a foam applicator.

The T-Cut stuff is old technology now, and doesn't have diminishing abrasives like the Poorboy's (and the vast majority of all the newer brands) stuff does, so it's not as safe for the paint.

Lots of places on the net sell the Poorboy's stuff, you won't find it in any shops though

Gareth