Milky White Fingerprints On Silver Coins

I hate to be the bearer of bad news but it sounds like the fingerprints are etched into the surface of the coin. Acetone and other organic solvents can remove fresh fingerprints before damage occurs. Skins oils are acidic and can etch the print over time and once this happens, the only way to remove is to dip them in E-Z-Est or a similar product.

Warning: this method is considered to be "cleaning" and will harm the numismatic value of a coin even more than a fingerprinted coin. However, it sounds like you have regular Maple Leafs so they do not really have much numismatic value anyway, just silver value(which would not be affected). If you are only interested in the silver value, then I would recommend this method. If you are collecting them as coins, I would recommend you leave them alone or consider trading them in for an unmarked example.

if you cleaned them (I tried to wash one off in some water with a very very small amount of standard dishsoap to no avail. It didn't even lessen the blight. ) they are already cleaned coins.
never clean your coins.... BUT yep I have done it all and I will be the first to tell you that none of it works "well" you can always pick out a cleaned coin. and if it had any numismatic at all you took at least half off.