Cleaning Coins

I think the best way is warm water and soap. But remember not to wipe it dry! Put it on a few pieces of tissue and pat it dry.

ooohhhh found in the woods? Ya know, they also found lots of Norman pennies in British forests!

The soap was a poor idea. There are way to many different types of soaps out there and many could and are dangerous to coins.
If you feel it necessary to clean any coin, do the easiest and savest methods first. Aquire some distilled water and emerse the coin in just plain, warmed distilled water. Normal dirt and/or mud should just come off with no damage to the coin. NO SOAP. Some soaps are exessively abbrasive for the removal of harsh substances. Lava Soap was a great example of that.
There are numerous posts methods for cleaning and not cleaning right here on this forum. At the top there is a thing called Search. Try coin cleaning, Acetone, etc in that place.