Cleaning an NV-68

I just swapped out my NV-68 for a MCW60-B. The NV-68 will be going in the classifieds, but I wanted to clean it first. A combination of vinegar and water did a pretty good job on the copper, but it didn't remove the white "spots" on the inside of the acrylic. Suggestions? So far I haven't broken the original Danger Den seals on the block, and push-comes-to-shove I think I'd rather leave that to my eventual buyer, is there any way to clean out the white stuff without breaking the seals?

Here's a pic to show you what I mean:

You can sell it as is...or, pop it's cherry and get scrubin

I have an acrylic ress that has white scum on the inside (and I cant open up the res) I clean it with "rinse aid" used for dish wahers to make glass squeeky clean. A 1/10 dilution.