Had gotten a quart of Frankford Arsenal brass cleaner with my tumbler when I bought it and had used about half of it. Was going to do a batch yesterday and noticed my measuring bottle had mold in it. Looked inside the jug and sure enough the solution was moldy and stunk. Wasn’t impressed with it’s performance anyway and this just sealed the deal. The Lemi-Shine, turtle wax/plow wax combo I use works much better. Pays to take a look in the bottle before dumping it in your tumbler.