I have not used the 303 before, but I have tried the RaggTopp fabric convertible top cleaner and protectant.
The RaggTopp fabric convertible top protectant is in the aerosol (spelling?) form. So, proper masking of the areas around the fabric top is very important. For me, I didn't do such a good job of masking it, so I didn't apply it evenly or apply enough of the product for areas close to the body panels.
But for the areas where I have good coverage, water beads very nicely on the fabric. But as far as longevity goes, I don't know yet. But having said that, I have already used up the protectant from my first RaggTopp cleaner/protectant kit. But my brother have used it before I had a chance to try it on mine. He used up quite a bit of the protectant on the tiny top of his Elise.
Previous to using the RaggTopp, I have used the BMW Impregnator/Protector. I didn't have so good of a result on it, but probably because I didn't mix the solution correctly and probably didn't use enough of it. But I've read a lot of great reviews about the BMW solution as well.
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