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There's one way to find out. I take a chain, dump it into US cleaner with autoglym and see if it comes out clean. If not, I bring the big guns back out. If it doesn't dissolve ziploc/sandwich bags I can use quite a bit less than the tank size. I could also reuse it but letting it settle and decanting off the clean stuff into a container.
I've used that AutoGlym on this person's recommendation. When I could be bothered cleaning bikes, it worked really well.