That "new coffee pot" plastic taste.
Other suggestions included vinegar, powdered "coffee pot cleaner", and running it through the dishwasher (well, please don't run an electrical appliance through your dishwasher, OK?)
But I did have something on hand that eliminated the smell and taste completely - Vodka. Thoroughly moisten a paper towel with vodka (Everclear would work, too) - and wipe down all the interior surfaces (especially plastic ones). Mostly this means the water reservoir, the filter basket, and any lids. The glass carafe can be done, too. Use at least a shot or two of vodka. (Not counting that which you drink.) Follow with a thorough rinse.
Evidently the bad-tasting plastic residue is soluble in alcohol.