When I got my Gti mine were pitted and pink, I cleaned them with a good stiff brush and some wheel cleaner then used some red turtlewax/t-cut colour restorer I had lying around, coat of AG SRP, then waxed them. They stayed brilliant red for the rest of the time I had the car and needed nothing more than a jet wash through the wheels to keep them looking great.
Spend a bit of time on it and you'll reap the rewards.
