RE: Bimini/canvas in the washer...
John et-al; I did just that about 6 years ago with our bimini and it turned out great. I did do one added thing though and that was to do the wash on a sunny day and only partly dried the top in the dryer. I then took it back to the boat and installed it, damp, and let it dry on the frame. Don't know if it would have shrunk but I did not want to chance it I also sprayed some zipper lube on the zippers once everything was dry and it worked out fine. Don't know about the long term things as the bimini came off a few months later when we hauled the old girl for the re-fit and the bimini has been living in the store room since.