The BLACKFIRE Clay Mitt is designed to replace the traditional clay bar in the decontamination process. By using a special kind of polymerised rubber bonded to a microfibre mitt, it is able to dislodge bonded surface contamination when rubbed over bodywork and glass, and thus mimic the result of using a clay bar (i.e. it restores perfect smoothness). Furthermore, it does this without needing to be kept warm during use, and it can be rinsed completely clean with running water, meaning it does not have to be thrown out if you accidentally drop it. However, perhaps the biggest benefit the BLACKFIRE Clay Mitt offers is the time-saving it offers; on a like for like basis (versus a medium-strength clay bar) it gets the job done much faster. Are there any downsides to using the BLACKFIRE Clay Mitt? Just one in our experience; while it is easier to use and works much faster than a clay bar, it does tend to inflict light marring if your technique isn't spot on. With a little practice this almost becomes a moot point, but it's important to bear in mind to start with, because after your first few attempts you may need to do a little corrective polishing. One way to ease this is to use a thicker lubricant; we've tried using both a blanket of snow foam and one of the thicker iron-dissolving cleaners we stock, and both methods work well, so feel free to experiment to see what works best for you. Just remember; you can never have too much lube!