Help!

Anyone know how to get the stink out of plasticware?
I have looked for solutions online, but didn't find any specific to plastic containers. I did, however try one that seemed like it might work.
I have a cup for mixing up my protein shake. It looks similar to those salad dressing mixers. I guess I left it for WAY too long. I found it while cleaning out the back of my car. Mmmm. Could have been there for ages!
It smells, quite literally, like skunk. I don't want to throw it out, but cannot imagine drinking out of it when it smells that bad!
Last night I left it soaking with 4 oz white wine vinegar and 12 oz hot water. No change. Any other suggestions?