Does anyone have any good Soloutions for a boat cover that has mold/mildew? Other than through it away of course? It's canvas but kind big for a washing machine ? Any help????

you could take it to be professionally cleaned? They also make mildew remover, don't know if you've already tried that.

commercial washing machine at laundromat

Put it on the boat, take them both to one of the do it yourself car washes and scrub the heck out of it. Take it for a spin on the freeway on a warm day to dry it off.

Just lay it in the driveway and give it a good soapy washin. Scrub it with a bristled brush and voila. As for towing with it on, I prefer not to do so. It's kinda rough on the gel coat and will take the wax off in a jiffy. Many do so, but I personally feel its not worth it. It may keep a little bird poo out & sun off the upholstery but aside from that does no good but beat the hell out of your boat & cover.

Simple Green works great on Mildew, use Big Heavy's method with it. You can get gallon jugs of the stuff at Home Improvement stores for cheap