Interesting video but as has been said, cleaning coins or relics that have any real value should not be attempted, especially using acid. Having worked with number of archaeologists over the years here and abroad, I can say that when coins or relics are recovered, the techniques they use are very mild and slow to complete.
Several years ago I recovered a New Jersey colonial which was encrusted and someone in the club suggested an acid bath . . . . well, it cleaned the encrustation off in no time . . . as well as any detail that it had when found. I still have that coin which now is simply a round copper disc as a reminder as to what can happen if cleaning is too aggressive.
I evrn cringe when I see videos where someone finds a coin and rubs the dirt away to read the date. When I find a coin that is clearly not current, I put it in a container with cotton balls and forget about it. Soaking it in water and carefully cleaning the dirt from the date is always the start - anything worth more then bullion or melt gets careful cleaning after that.
As far as what professional coin dealers use, I do not think that they use acid dips since there is a grade when you get coins slabbed that indicate the coin was cleaned and that detracts from the value. I have dealt with several of the coin galleries ove rthe years and the one message they always say is "
Leave any cleaning to the professionals."
Just a word of caution since the newer detectors are finding coins that are worth $$$ and can make great additions to collections. ANACS offers professional grading for coins treasure hunters recover and are the only service to do so - they classify them as "Environmentally Challenged" and is a way to get your better coins preserved.
ANACS Coin Grading Options Brochure
If I find a silver coin that is worth nothing other than the silver content and I want to remove tarnish so I can put it in my collection, some silver polish paste does an great job in seconds and is a good deal safer than sulfuric acid baths.
Just a perspective to consider when cleaning your finds . . . . .
And one last comment . . . . your use of saftey equipment is commendable since injuries can and do occur all the time when least expecting them
BUT I would never use acid and the like in the house and where I cook food. I have used techniques that involve chemicals for various applications but the garage is about as close as I would bring them as far as the house goes. You never know when something spills and impacts the sink, floor, counter, carpet or even worse, someone living in the house. Just an observation
Andy