A powerfully aggressive cleaner that gently removes serious paint defects.If you need to tackle major paint problems--the worst possible stains, scratches, blemishes, and serious oxidation--this is the product for you. Developed to power out the neglect, Meguiar's #4 Heavy-Cut Cleaner is designed to be used with a polisher. Note: Rotary buffers run at very high RPMs and should only be used by someone with rotary experience. Meguiars recommends #4 Heavy-Cut Cleaner be used only with a rotary buffer but you can also use a dual action polisher for excellent results. #4 Heavy-Cut Cleaner is not for anything less than the worst stains, scratches, blemishes, and serious oxidation. #4 Heavy-Cut Cleaner has enough smoothing abrasives to repair such damage and restore the finish to a like-new luster. Although this is a very powerful cleaner, if used as directed, it is not harsh on anything but the problem.Blemishes--banished! Many detailing professionals and automobile restorers turn to Meguiar's #4 Heavy-Cut Cleaner. It's been a trusted and preferred product for years. If you need to pull out all the stops to eradicate serious defects (not just cover them up) and your not afraid to apply a little bit of elbow grease, you'll find Meguiar's #4 Heavy-Cut Cleaner will work wonders.16 oz.