I have the big one from Harbor Freight, and use it. Recently, I bought a set of three AMT Hardballer 1911s which were new in the original boxes. All the original packing grease/oil had turned to a sticky tar-like coating. My usual cleaning solvents wouldn't even make a dent in that goo. A few minutes in the US cleaner, though, had everything sparkling clean. Same results for an old parkerized GI 1911 I picked up for my wife a few days ago. The mess wasn't as bad to start, but it was really nice to have a perfectly clean frame to start re-building.
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