hey guys,

just wondering if anyone knows of a good way to clear up my back windscreen. the clear plastic has gotten really hard to see out of. in fact, i can barely see at all! any ideas on how to get it clear again? can the plastic be replaced? i noticed for the first time that it unzips and folds down, but it is attached along the bottom.
ive tried windex and that hasnt worked.

any help would be appreciated.