RaggTopp sells basically three products for convertible tops.
1. Top cleaner for either vinyl or cloth roofs
2. Protectant for vinyl roofs
3. Treatment for fabric roofs
I own all three products but have yet to use the fabric top treatment. The vinyl product is AWESOME though. For regular maintenance of my top I wash it with the rest of the car using PB's SS&S.
If the top you're working on is not stained then you could just clean it with SS&S. If it's stained then you should get a fabric cleaner like the RaggTopp or I think 303 makes a popular one as well.
If it's a vinyl top you should then protect it with a vinyl dressing like Ragg Top for vinyl, 303 Aerospace Protectant, or one of the Poorboy's products just to name a few popular choices. Make sure you buff off the dressing really well afterward with a towel or else it will run all over the car the next time it rains.
If this is a cloth top after cleaning you should protect it as well. 303 makes a popular fabric protectant, but I hear the Ragg Top one is really great.
I can't remember exactly which one, but one on-line vendor has a list of cars and if their top is vinyl or fabric in case you don't already know which material you're dealing with. I think it might be CMA, but I'm not sure. Maybe someone else knows.