If you're using your 4WD as it was intended to be used, it will have dirt caked onto the tyres. Even normal city driving will see the larger sidewalls of the 4WD tyres picking up extra dirt and junk off the road, compared to low profile tyres. We want to remove as much of that as we can before putting our Tyre Sheen on. We do this using our Orange Agent all purpose cleaner. First, wet the tyre, then spray Orange Agent directly onto the tyre and then scrub it with the Little Chubby brush. When you're finished, pressure wash or rinse them off thoroughly.