Can anyone suggest a fast but gentle meathod to remove tarnish from old coins etc.?

Before you do anything please read this!!

http://www.mycoincollecting.com/collecting/cleanin...

"The first rule of coin cleaning is: If you don't know its value, don't clean it, or if you think it is valuable, don't clean it, or if you know it is valuable, don't clean it. In other words, do not clean your discovered coins; leave them untouched and stored in proper holders. The reason for this is that coin dealers and collectors are interested in purchasing coins in their original condition and natural state of preservation."

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Leave them in a glass of Coke for a while then wash off with water. Sounds stupid but give it a go then judge what I suggest.

As you know i to collect coins when i clean them i use vinegar

or i go to the coin dealer and ask him how can i clean my coin without damaging them. I collect silver and small gold coins.

I wouldn't mix vinegar and baking soda... not a good combo... but vinegar by itself works pretty good... I did a science fair project on that a long time ago... nice and clean and stinks to high heaven... haha

Olive oil. no joke, i've done this to some old coins for a week and it worked.

Coke works!

I soak pennies in vinegar to get them shinier.

wrap in foil, cover with baking soda @ pour boiling water on them

Don't clean them; you might reduce the value. If you decide to clean them anyway, try using denture tablets first.