i dont know that anyone makes a convertible specific manual. i know haynes makes a manual for s197, but it covers everything except the gt500. i have a haynes manual for my 94, and just looked and it doesnt even have a convertible section in there. so i dont know what to tell you about that. but i always use raggtop on my top, and have also heard good things about aerospace 303 vinyl protectant.
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1994 Mustang GT, just a few minor appearance mods, engine mostly stock (for now)
+1 on Ragtop. I use the cleaner and preserver and really like it. It gives the top a nice "new" look and last for about 2 months. I've used other stuff but Ragtop seems to be the best.
Thanks for the advice on the top cleaner, ive been getting some small brown spots around the seams that i cant remove with soap and water and i was starting to fear that the top might be discoloring there. so i cant wait to try the ragtop cleaner...