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Recently got to try both. My aunt has an old white, '94 jetta, that has NEVER been detailed, and she was getting ready to sell it. It was covered with rust spots mostly on the hood and wheel well areas, I tried both the white and blue clay, as well as some Poorboy's clay I had left over, and couldn't get all of it. I tried out the samples I had of ValuGard's ABC system, and the results were amazing, didn't leave the paint feeling smooth like the clay did, but it sure cleaned up the paint REALLY nice. I think Meg's needs system like this for those of us that sometimes have a basket case to do.
Another wonderful product that I think meg's should come out with is a low water wash, like QEW. I'd previously been using #00, and I loved it, but I'd still get water spots from areas where the water can hide in my car(hood scoop, side scoops, front grill area, mirror housings, etc.) and when I ran out, I picked up some gold class, which I hated. The lubricity was nothing like #00, and it left water spots all of the paint. I gave it to my girlfriends mom, she said it was better than the dishwashing liquid she'd previously been using (
). So then I pick up some QEW, and I must say, this stuff is awesome. I've never washed a car so quickly in my life, and the best part was, there wasn't any maring there that wasn't there before. It's definately a time saver, and feels a lot like the #00, except without all the extra water and everything 
Another wonderful product that I think meg's should come out with is a low water wash, like QEW. I'd previously been using #00, and I loved it, but I'd still get water spots from areas where the water can hide in my car(hood scoop, side scoops, front grill area, mirror housings, etc.) and when I ran out, I picked up some gold class, which I hated. The lubricity was nothing like #00, and it left water spots all of the paint. I gave it to my girlfriends mom, she said it was better than the dishwashing liquid she'd previously been using (
). So then I pick up some QEW, and I must say, this stuff is awesome. I've never washed a car so quickly in my life, and the best part was, there wasn't any maring there that wasn't there before. It's definately a time saver, and feels a lot like the #00, except without all the extra water and everything