Lol, far from expert, but I clean the underside of mine with some diluted Bilberry wheel cleaner and a soft brush.
depends how bad it is as to what to use but a good cleaner and brushes are a good place to start to remove all the surface dirt and see what’s underneath.
Bilberry wheel cleaner
Bilt Hamber autowheel
Tar & Glue remover to dissolve tar spots.
Under chassis pressure Lance.
Once it’s all cleaned back, give it a good dry and once we’ll dry, coat in Bilt Hamber Dynax UB for black/dark areas and Dynax UC for any areas you want to just have a clear protection coating.
Thanks all, good advice.. would you put the dynax in straight on after you have cleaned it up? Or is it worth while using something like zg90 paint first to bring it back to black and then put the dynax stuff on top? Thanks
The Dynax is a protective calcium wax barrier. So it goes on last over the top of your desired colour/finish coat etc. Remember, Dynax UB is dark brown, Dynax UC is clear.
UB is the hardier of the 2 finishes.