Good Reviewed Coin Cleaner ?

You may also search members here for "DOCC", in his signature line on his posts, there is a link to his blog regarding restoration of coins which you may find helpful.

Good links, thanks John.

I got all that from DOCCs' signature. I do not have a detector anymore.
John1

That is a website with some very nice and well presented information. Good you shared the link, John1.

If it were mine I would only add that 5% sodium sesquicarbonate may be weak to treat active bronze disease. Very slow process with that solution.

In my experience old medieval coins being eaten away require weeks in the solution. With periodic removal of the green oxide crusts from the pits.
I use hard wood splinters to pick at them, then leave the coin in solution a week longer, a couple of baths. Hoping all the chlorine in the copper diffuses away.

Have considered picking with brass wire to hasten the process. A needle will do it but one slip and you have an unwanted scratch. Not disastrous in a half-corroded medieval coin but not nice.