I was watching a YouTube video this afternoon where a shop had a large heated ultrasonic cleaner full of Evaporust, he said when the level gets low they top it off with distilled water. The FAQ at the official website doesn't mention that at all, I'm sure they like their profits. I did strain the remaining liquid, transferred it to a smaller pan and cleaned all of the sediment from the large pan. They advertise that 1 gallon will dissolve 5lbs of rust, that sounds like a lot and I started with 2 gallons... I feel like I've said all this before.
I'll have to do something with the fuel tank soon, I'll probably have to buy more for that. I'd love to find a cheap way to have a recirculating pump like a parts washer to just let it flow over large items. And lastly in the video I mentioned they did a comparison test with some rusty chunks of the same steel, room temp, 140F, and 140F ultrasonic. The 140F was clean product and the stuff in the ultrasonic was murky. The 140F new solution worked best and was fast too. I wonder if I drop in a few of those chemical hand warmers how warm they'd get a couple gallons of this stuff? I should probably start looking for used insulated coolers to use for this, maybe not airtight but should hold the heat in.
From the FAQ at their website: HotHands® has perfected the process so that our warmers, depending on the individual product, produce heat anywhere from 100°F to 180°F for duration of 1 to 20+ hours. And Evaporust is safe around plastics....ill be trying this in a cooler for sure.