What type of coins are we talking about here?
Water and a toothbrush is your safest bet for collectable coins. For anything else you can clean them with baking soda, water and a toothbrush add some vinegar or lemon juice if you want to put a nice shine on them.
Both silver dollars and half dollars, and the copper pennies.
Water and a toothbrush is your safest bet for cleaning silver coins. I would not recommend any type of abrasive like baking soda or any acid on them, same thing goes for old wheat pennies.
Thanks for the tip! Much appreciated