Greetings. My '05 XC70 washer reservoir has a leak; it's a narrow vertical crack, maybe 1/2" long. I am looking for repair suggestions that I can try short of the hassle of replacing the reservoir tank. I thought of silicone, waterproof caulking, such as one might use for bathroom tub surrounds, etc., but that doesn't hold the washer fluid, which seems to eat through it. It's a plastic (polypropylene?) tank, and I figure there must be something I can try. Thanks