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I've been trying to get the gas cap off the Multipla for about a month now off and on with various loosening agents. Admittedly a good chunk of that time was figuring out how the locking gas cap worked - (spins when locked doesn't when loose) mixed up the 1/2 acetone 1/2 ATF and put in a spray bottle. Put it on at noon, just came home from a cruise night, was putting Ms Triss to bed and thought, "I wonder..." sure enough a couple taps and off it came. I am very impressed.