I keep seeing the banner ad for "Magic Rinse" www.magicrinse.com. Does anyone use this (or similar)? I'm thinking more for the use with dark colored vehicles. It sounds logical as it's supposed to remove the minerals, which is what leads to spots. I do have a water softener at home, but it doesn't completely solve the problem. Just curious if anyone is using a product like this and do you think it's worthwhile? Most times when I wash, I keep spraying the car/truck/boat/whatever to keep already cleaned areas wet until the end (so those areas don't dry up). Then I come back with a squeegee and a towel and work like a madman to get all the water off before it dries... kind of a pain.