I've been a massive fan of DetailedOnline products really - very effective and good value for money.
The main things you need are tar remover, fallout remover and claybar - you may or may not need lube depending on the product. I use Bilt Hamber medium clay with water.
Tar remover - only do one panel at a time, leave to dwell for 1-2 minutes and wipe with microfibre, then rinse off. It also bleaches plastic so be careful.