No. You might spoil them. Leave that for an expert.
No. Coins always lose value when they are cleaned when compared to uncleaned coins (the exception being coins that are dug out of the ground that are encrusted in dirt). Do not clean your collectable coins!
the best way to clean copper or silver coins and jewelry is ashes
How does vinegar clean coins?
No, cause then they look older
No. When cleaning the coin you cause it to lose its authenticity and value.
Ebay is the best place.
Don't clean your coins. That will ruin them.
do as best as you can
Dawn Magic Eraser!
It depends on what type of coins you have. If the coins are collectible coins, that is, old, high grade, and desirable, the best place to find the value of them is in the Red Book coin guide or take it in for an estimate by a coin dealer. On the other hand, if what you have are low-grade, common coins primarily for their bullion value, I will include Coinflation which is a website that shows the precious metal content of pre-1965 US coinage and Canadian coins in the related links. You might also want to check Ebay for what people are paying for the coins you have. Keep in mind that you should never clean old coins because that destroys the value of them.
Never clean old coins, pennies, nickels, dimes, etc... Coin collectors want the natural patina. If the pennies have dirt on them then soak them in water to remove the dirt. But don't use any detergents. Detergents can damage the surface of the coin and leave pitting lowering the value of the coin. Also do not rub the coins together to loosen the dirt, this can scratch and wear the coins and lower the value. Coins (US Coins) will be worth face value to a non-coin collector, but if you plan to collect coins or just clean them to sell as collector pieces, then don't clean them.
DO NOT TRY TO CLEAN VALUABLE COINS. The only coins you should try to clean are common-date coins you get in change. Anything you use to clean a coin may make it look shiny for a while, but the cleaning affects its surface in a way that will accelerate the damage later.