What black trim?
Around the windows? use 303
For the dark grey cladding use 303 or similar
Also the Stoners Trim shine works well....as stated by other Avalanche owners I know...
PS I own an Avalanche....Some tips
Make sure you remove all the bed covers and clean them and protect both sides
Also remove the bed mat and wash and wax underneath and tell your customer you did....
apply 303 or similar to the midgate seals
Be careful lifting the wiper arms as they will hit the hood......
Be careful shutting hood...do not press down to get the second latch as it can be dented....just drop hood from about 1-2 feet....
CLean inside them fender wells....and then apply some cheap dressing....really makes it look good.
The tires are big and heavy so if you planned on removing them to clean both sides get some jack stands and a large floor jack....
Clean the paint first with one wash solution...then clean the cladding with another wash solution using a different wash mit or soft brush......
USe the white eraser to remove any wax residue from the cladding.....
I stronlgy suggest using a leaf blower to dry as those side mirrors will drip for hours....and it is a large vehicle.....
The interior is not too bad as everything is easy to reach......Remember to flip the rear seats to clean under them...
Good Luck....