Found a ziploc of mercury dimes and silver dimes but they are all brown and dirty. Any way to restore them or are they gonners/ should i attempt to clean them or will they lose value?

To a collector, ANY cleaning is destructive so if you plan to sell them, leave them as they are. That being said, unless they are in great condition (sharp details, minimal scratches, no rim damage, etc) or key date coins your best bet is selling them for the silver content.

I don't deal in scrap coins so I can't suggest a value - it's determined by face value multiplied by some percentage.