Typically I would come up with some ingenious witty remark but my smarty pants processor seems to be acting up. So, seriously, I would try to find out what it is even if it meant cleaning it. I wouldn't recommend this to anyone else of course. I would want to know what it is and curiosity would eventually get the better of me. I would start with research and potentially end up cleaning it. This would mean potentially ruining whatever it turns out to be. I know you didn't want to know what exactly I would do but if you're like me, not knowing could drive you nuts once you look all over and can't find it.