How do you clean sticky Tupperware?

In my pretend move, I'm reaching to the back of the tall kitchen cupboards, standing on a chair. And what do I find? A large Tupperware canister, suitable for a one lb sack of potato chips or a few dozen cookies. It is so sticky, it almost wouldn't leave my hand once I took hold. The usual things I try don't work. Is it decomposing? Is it absorbing chemicals from the cupboard finish? Is this left over potato chip grease from the 1960s? So I go to the internet and google "how to clean sticky Tupperware" and someone suggests Bon Ami, which is the only ceramic cleaner I use. I dampen my piece of Bounty and go to work. Wow. This really works. And while I was at it, I buffed up a handmade ceramic bowl I found in there too that had some marks on it probably from metal. From the color scheme--gray, gold, taupe and cream, I'm guessing early to mid-1980s, and probably purchased at an artsy-fartsy shop here in Columbus, or at an art show. The name on the bottom is huge both upper and lower case, Wilks. So I google that and find a Kelly Wilks from Arkansas who works in clay, and I e-mail the supply house with which she is associated and teaches. Waiting to see if I've found the artist.