How do I clean my sticky 1970 small s coin without trashing it?

I found a 1970 small s penny in beautiful condition and it has some sticky stuff on it that has not been on the coin long.It must have come from a coin set to be this nice. ( some kids with dads collection?) I want this coin in my book but need the sticky off first. Its a good coin to learn cleaning on for it will not have value if not at its best. professionals only please....

let it sit in warm water and see if the sticky matter wipes off

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