I don't pamper my soft top. Sometimes it's in the storage bag, sometimes it's not. I once used 303 on it and it seems to work as advertised. Then again, my top spends most of it's life not being used. It's folded, creased and has some tears in it from when it flew off the Viper years back. Creases don't scare me, tears actually makes it look better. I take comfort in knowing that I can replace the canvas at any time for a nominal fee.
The soft top, for me, is like that comfy, torn, discolored old pair of underwear ya' just can't seem to throw away even though you know it's useless. Well, except for that once-in-a-while situation where you run out of underwear and old reliable is ready to rescue you. That pretty much sums up my appreciation for the soft top.