HD-Cleanse is very similar to most of the other filling (kaolin
clay) based glazes. It is oil based, has very mild cleaning abilities, hides small defects and swirl marks, and helps waxed base LSP's adhere correctly (how much truth there is in that last one is open for speculation). It can also be *very* hard to use. Particularly, hard to remove. It works best (for defect hiding) when it's allowed to "remain for 20 seconds" according to the directions. Waiting that long is going to make the removal very difficult, but you will get good defect hiding if you do wait. When I use it, I immediately wipe off the residue after I've completed applying it to a panel, since I don't use it for defect hiding.
It works great on just about any exterior car surface. It will remove white "wax" marks from black plastic, and help to restore worn, dirty, or dry rubber seals. It also works great on glass.
The filling properties of HD-Cleanse will disappear after only one wash unless you top it with a wax based LSP's. Don't waste your time using sealants over HD-Cleanse, as the oils in it will prevent the sealant from bonding correctly.
It's definitely a you're gonna love it or hate it product. The more I use and get comfortable with it, the more I like it. But again, I don't wait for the recommended time to remove it, either.
So I guess to summarize: It's a decent glaze that is hard to use and costs too much for what it does.