I'm not Italian, but Argentinian and it's funny how we have most of these, though some of the definitions are slightly weird to me, for example, the one on the cover means "what", back tips of the fingers on the chin means "I don't know". There's also a very interesting one we have, idk where it comes from, where one closes the fingers and bends the thumb a couple of times, sometimes accompanied by saying "minga", which means something like "jaja, no way, not doing that".
I've never had a problem keeping my glasses clean. I understand people who take them on/off having problems, but if you just have them on all the time, what are you doing!? I clean mine max once a day, usually can go 2-3 without cleaning.
The only time I ran into problems was working with polishing metals. My glasses were getting scratched with the small particles/dust you couldn't even see. I almost thought they were faulty.
I fixed it by just rinsing before putting soap (before I would directly lather soap). Now I just rinse on both sides, soap softly, rinse, dry with softest tissues around.
In a pinch some alcohol will do, but do not like it or other cleaning solutions. Tissues only take 1-2 wipes unlike microfiber clothes which I also don't like.
I avoid touching the glasses themselves, only ever touch the frame (only part it's worn in 5 years is where I touch it), never put them in a case, always put them on my nightstand to sleep.
I replace them maybe once every two years, usually because I've ended up scratching them when accidentally hitting something. They're regular CR 39, nothing fancy (I like it due to it's high Abbe number, cannot stand the chromatic aberration on high index lenses).
Also it could mean don't know + don't care depending on the facial expression, but I've not seen it as just don't care.