I hope this subforum is the right place for this question... I need some suggestions on cleaning the insulated coffeepot that goes with my coffeemaker; it is not glass, but insulated steel (keeps the coffee warm without heat under it the whole time). Like a Thermos. It has brown coffee grime/stain inside. I have taken a brush and Barkeeper's Friend to it, and SoftScrub too, wiith not a lot of success. Anyone have suggestions on what I can scrub/clean/soak it with to get it clean inside?