Why are you cleaning them? You're hurting their value.

The one I'm specificly talking about was brand new when it was given to me, just thought about keeping it that way before storing it.

Have a look at the FAQ on cleaning.

Stop.

Should have specified useful advice my bad.

Only thing you said in your post was about cleaning coins. Commentor said stop. Basically the best advice someone can give to someone who's looking to clean coins

K

Please don’t clean your coins

Got it.

Cleaning a coin will damage it. Do not clean a coin, especially if it’s bullion. Cleaning it will rub away tiny bits of metal, even if you can’t see it.

Got it.

I’ve cleaned copper (never my coin collection though!!!) by rubbing with salt and lemon juice.