Actually I have sometimes just held them with my fingers, but, then again, I'm not as afraid of chemicals as I should be . This is the kind of basket I have used (but not that dip).
Sorry but you are dead wrong - on both counts ! It's absolutely abrasive and you've scratched every one of them to death. Now you may claim you can't see it, but if that's the case it's only because you don't know what you're looking at.
I'm gonna be honest here, it's a bullion coin, it's worth melt. I say have at it! dip the coin in Ezest to remove the toning then sand out all the scratches and go finer and finer to wet sanding, then use a microetcher to refrost the devices and jeweler polish bar and a soft buff dremel to re-mirror the fields. Will it be "as minted"? yeah, probably not, will it look nice? If you spend the time on it, yeah, it will look nice. heck, reverse proof it if you like! **Disclaimer: do not do this on coins of numismatic value, but bullion, why the heck not? it's not hurting the value.**
I know I have bought coins that have some splotchy toning and have lightly (<1 sec) dipped them only to have people on here tell me they are "overdipped", but then I realized it could be something that happened before I bought the coin.
I've always just used my fingers, never been hurt. Just pour some solution into a shallow bowl that is large enough to give you plenty of finger room and don't fumble.
OMG, i can just imagine your heir's disappointment when they're told your entire collection is polished junk.
Hardly, Again I don't use the cloth on mint state or proof coins. Most all those are certified, graded, and slabbed. The mint state ones that are raw are simply washed and rinsed and air dried, then put in 2x2 flips and protected by Dansco Album 7000 with slipcover. So, no my heirs are not getting polished junk.
Use it on, say, a $500 fine-VF 1904-S half dollar, and watch it turn into a $100 coin. Polishing is even more obvious on worn coins. You may like the shine, but you are absolutely WRECKING them for whoever gets them next. Have a thought for their value as original coins.
I am not trying to kick you in any way. The person that taught you these methods of "cleaning" should have to go kneel in the corner, and think about what they have done. There is a big difference between cleaning and a proper restoration. Washing a coin is not a good practice, rubbing the coins surface in any way, is a big NO! And yes that includes soap, and rubbing it around with your fingers. It is causing hair lines that will detail a coin by any of the reputable TPG's. (well I should say before market grading) Even rolling a qtip on a coins surface can cause hairlines and therefore take value from the coin. For your MS coins you can easily soak the coin in distilled water, acetone, Xylene and follow it with a distilled water rinse. This at least leaves the coin in the same condition you bought it.
When I wash them, I hold the coin on the edges and swish them around the soapy water, then rinse them the same way. Never touch the coin's surfaces, and never rub the coin. Air dry and then pat them with a soft cloth, never rub.