) Sometimes you need to get a bit harsh if there are deep stains but if the only complaint is leaks I would recommend against anything harsher than a good scrubbing, especially if it's an older top with worn stitching. 1200 psi is pretty hard on a piece of thread. Pressure washing from the inside probably won't help much (probably won't hurt either). If the fabric is worn enough to allow water through with any force left, you've got bigger problems than a little dirt IMHO. Good luck, I'm sure you'll solve your problem.
<br /><br />I'm not suggesting the fabric mfg is wrong either, so don't read that into it. I think anyone interested should research the dry cleaning process and understand why heat is only used when and if the material dictates it safe and necessary. Comparing this to melted buttons is apples to oranges and really says the cleaner didn't know what he was doing. <br /><br />I'm in no way a dry cleaning expert but quickly said, it is a process that identifies the materials and selects cleaning fluids and methods that will not harm the material, finish, thread or accessories. It isn't "one way does it all" and it is way less hostile to your covers and sails than backyard cleaning could ever be. Like already posted, the hard part is finding a commercial dry cleaner to do the work. The ones who do hotels are the right ones. <br /><br />Last but not least. Once the original waterproofing finish is gone you will not be able to duplicate the same long life with aftermarket waterproofing. The only way to come close is to saturate the material by brushing or soaking. 
