One thing I noted while going through their whole site, was one of the pieces they used before and after was not the same piece, the before piece had a deep gouge in the side of it and the after pic looked new out of the box. But that was only one item out of a bunch. Reading the testomonials, and their description, it appears the rusty items need to be submerged or have the solution continually running on them for as much as 1-2 days depending on the severity of the rust. Not a real good thing, but the solution is recoverable, which is nice considering the price, I guess. JMTCW.