The coffee basket is harder to see (could there be a reason they make them all brown, so you don't see the gunk?). It had a LOT of accumulated oil on it that hot water and soap did nothing to dislodge, and I couldn't even get a toothbrush around those little "fins" in the bottom. When I pulled it out of the denture cleanser water, it looked a lot better, and then I ran Q-Tips over all those little nooks and crannies in the bottom and got virtually all the crud out. I didn't have to scrub at all!
So, what else have I found that they work on?
• Anything made of glass — particularly hard water stains and iced tea stains.
• Glass baking dishes (Pyrex or generic) — getting baked on crud off, as well as residue from non-stick sprays.
• Stainless pots and pans — any baked or burned on crud. DO NOT use on nonstick pans, and I'd be careful using it on any pan that wasn't stainless (I haven't tried it, but I'm afraid there might be a less-than-desirable reaction with an aluminum pan).
• Any type of a Thermos, carafe, vacuum bottle or air pot.
• Coffee pot.
• The bottle I store iced tea in (an old clear plastic juice container).
• Reusable water bottles (particularly if I've made Gatorade or something else with sugar in them).
• Coffee and tea mugs (particularly stained Melamine ones), including our insulated mugs.
• Iced tea glasses (ours are plastic and were OK, but I'd try it on one before soaking all of yours just in case it takes any design off — this is at your own risk!).
• It also helps significantly if you have any food storage container ("Tupperware") that had spoiled food in it.