I've tried this on a couple of items and will update my review accordingly.1. 10 Year Old Camshafts (found in the Back of my garage) - rusted and oilyResults: Submerged for 24 hours and most of the rust and all of oil was gone. I took a Scotch Brite pad to the remaining rust and it came right off.2. Battery Corrosion in Flashlight (three AAA batteries were in a flashlight in my car for two years)Results: I soaked the corroded battery holder (the plastic piece that held the three AAA batteries inside the battery case) for two days and most of the corrosion was gone. This was after I tried using baking soda. A quick hit with a tooth brush sealed the deal. The metal contacts are not perfect, but clean enough that I can use the mini-flashlight after it went unused for at least years! The corrosion inside the aluminum flashlight was fixed with baking soda, but if it was any worse I would have soaked the corroded portion in the solution.Overall, this is a good non-toxic product. The are faster alternatives, but it's safe, reusable and can last for years if you keep it sealed.Next on the testing block will be an old rusted pressure plate from my Nissan Silvia clutch and a bunch of rusted bolts.To be continued....4/14 Update:I filled two Quart containers with oily, rusted bolts that I found around the garage and added Evapo-Rust. After one day, the bolts looked a little better, but nothing amazing. Day two looked better. On day three, you could see a layer of crud building up at the bottom of the containers. I decided this was long enough, so I dumped them in the sink and grabbed a clean rag.The remains of the rust wiped right off most bolts. The rust that was REALLY invasive, didn't come completely off, but I have no doubt another few days would have done it.While you can recycle Evapo-Rust, it was so dirty from the oil and rust remains, I decided to get rid of the used portion. Overall, 98% of the bolts look like new (in addition to a few rusted nut driver bits that I threw in for good measure) so I can't complain. If you are in a rush, you may want to try something else, but I like what I've seen so far.In terms of the chemicals, there was little to no skin irritation on my hands, so that's a big plus!