A new black top is a walk in the park. I think all you need is right here.
http://autopia.org/kb/index.php?page..._v2&id=29&c=21
When cleaning, use a brush pliable enough so as not to damage any stitching. Go very easy on the strength of the cleaner. Let it dwell a few minutes to break down dirt if needed. Use a shield as you spray the top with protectant to avoid a mess on the paint and surrounding areas. I use a small piece of cardboard. Wipe any overspray before it dries. If you have time, mask the car off with newspaper. The top probably will require very little cleaning other than washing if the top is maintained. The water will bead and the top will look great. Just like wax, when the beading lessens the protection is degrading.
Buy a kit for the job. That is a fabric top. Both 303 and RaggTopp have the goods. Another vote for RaggTopp.
Just stay on "top" of the regimen.