We had a 6l one at the shop, I worked at a couple years ago. Basically the cheapest one off amazon. We used simple green in it and worked pretty good. But it did take a bit of time to heat up. So like others posted we used water from the hot water heater. We had to clean parts coming from the cnc shop, used it for pretty much every thing that fit in it. It has a spigot on it for dumping, which was nice. I have a Hornady one for cleaning brass, maybe a litre, use simple green in it as well.