Need tips/ideas for applying tire shine to spare

[Manhattan]

There are a couple things about the spare tire on my Toyota Pickup that make it a bit of a hassle to apply tire dressing to.
- The location - sunk into the bed and surrounded by sheet metal and glass - tricky to spray
- The tread - the sorta chunky AT - makes it hard to wipe on

This isn't that unlike a tailgate/bumper-mounted spare... so I'm assuming there's technique and/or applicator that works great here.

Thanks!