The Nanoskin pads and Speedy Prep towels are great clay substitutes although they tend to be a bit pricey for the average guy. But hey, if you're prone to clay dropping then these could be just the thing you're looking for as you an simply rinse them off if you happen to introduce one to your garage floor. The more aggressive versions of these things can be very aggressive and I'd recommend you stay away from them unless you fully intend to machine polish after use. Just because it's more aggressive and will remove more gunk from the surface in less time doesn't mean it's a time saver, especially if it hazes your paint when you had no other defects previously. Just follow the manufacturers directions and don't get overly aggressive when using them and you'll be more than fine.