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It sounds like you might be thinking that these will clean the parts by themselves once you "press the GO button". They wont. You'd need something like a jet-clean cabinet for that, and they're a couple thousand new. That "probe" you can see in the pics is actually a nozzle that you point at the part. A stream of solvent comes out of it and is constantly running over the part while you are scrubbing on the part with a stiff nylon bristled brush. Just like washing dishes under the water steam in your sink. Works pretty good for light grease or oily parts, but for something like an old tractor part with alot of caked-on thick gook, I usually spend a while with a putty knife or wire wheel or something getting the majority of it off before it goes in the parts washer so that all that gunk doesn't just accumulate at the bottom of the tank and dillute the solvent. For a heater I've used one of those magnetic heaters they make to stick on the oil pans of cars in the winter. Don't know how warm it'll really get the solvent, 'cause I never left it on there that long. The better stuff is flammable so I didnt want to risk leaving it on there. Wouldnt think the flamable solvent would freeze though. I've never used the water-based solvent. Heard it didnt work that good or last too long. One thing to check on a low-priced parts washer is that some of the cheapys I've seen have pumps that are only supposed to be good for the water-based solvent, at least according to the descriptions on the Northern Tools website.
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