This was my short review of it from months ago:
OK guys and gals. I just went out and put a little of the S100 Polishing Soap on the muffler on my car. A little background. The subject muffler is an HKS Hyper stainless steel muffler with those wonderful computer welds on it. It is kept in very good condition at all times. Yes, I lay down under the car and polish/clean away even if I don't drive the car about once a week. Gotta keep the dust off ya know! The application was as simple as the instructions make it. I wiped the dust off the muffler and proceeded to add a little water to the supplied sponge. After taking the damp sponge and wiping it a couple times across the dry polish, I gave it a few squeezes to make the suds come up. I then took the sponge and applied the suds to the muffler and tip just like I would have a metal polish and let it dry to a haze. I then took a clean MF towel and wiped away the residue. The residue was wiped away with ease and no streaking. There were no stains to remove but I will say that this has to be the least messy way to polish metal that I have found yet. I don't know what it will do for metal that is oxidized as there is none of that around my house and I didn't come across any today.
For stainless steel, this product gets my vote. The cost is about 9 bucks and the sponge and soap are self contained making it easy to have and use. Clean up is as easy as rinsing out the sponge in clean water. The jury is out on how well it works in other situations. All the aluminum wheels I have around here are coated so they are not compatible with this product.
