Thanks Muddiver for this interesting thread (even if the results of the study you quote aren't really surprising; mycosis can be a concern as well, though the study wasn't specific about it) and thanks NWGratefulDiver for this hilarious (and very pertinent) video of M. Carlin.
I use chemical defogger (because I found it more efficient than saliva) for my mask and when diving in the sea I always rinse it with salt water (usually
not from the mask bucket). I don't see any need or reason for rinsing a mask in
fresh water before a dive in the sea.
In my opinion and from what I have seen, many, many divers from all nationalities waste precious fresh water (especially in desert areas like around the Red Sea) by rinsing too much, and without real profit, their gear. I think that, apart from cameras and lamps,
only the regulators (and the inflators) really benefit from immediate fresh water rinsing between the dives of the day, and after these dives ; and this can be done by each individual by
just soaking his/her second stages (no need to rinse the first stage it it's a diaphragm reg) in a
very small, personal, bucket (I mean just big enough that you can soak a second stage at once).
During a typical one week vacation, I think it's useless to rinse your wetsuit (especially in a communal bucket full of dirt !) unless you pissed in it; and if you pissed in it, please rinse it
only in the sea, and not in the communal bucket, so others don't benefit from your intimate flora and fauna; to kill bacterias and mushrooms, it's good to expose the inner face of the suit to the sun (for a short while) till it's dry. The sun is a natural virus, bacterias, and mushrooms, killer ; just don't expose your suit too much once it's dry, otherwise the heat will damage the neopren. It's completely useless to rinse fins unless they have some stainless steels parts, and then you just need to rinse these parts with a little water. Same with a BCD. Etc. All this can be rinsed at the end of the vacation.
I prefer not to rinse my wetsuit, booties and mask than to rinse them in filthy communal fresh water (my gear may well be filthy too but I am not fond of sharing my dirt
).