yeah I tried simple green with no luck.
I tried high pressure water with no luck.
I tried putting various "abrasives" inside (shaved ice, sand, even a bunch of nuts & bolts
) and shaking the crap out of it... no luck.
I tried pipe cleaners with no luck.
It is almost like the plastic is stained (although I don't think that is the case).
I didn't try rice but perhaps I should
Perhaps I'll just spring for the $24.
Heaven knows the amount of time I screwed with it cost me more than that