I pick them when they are on the glass I use a net that I make sure will be running flat...
I start slowly from the bottom making my way up jerking a bit up and down, scaring them and they fall in the net...
Then I have "clean" glasses for a week. not much more.
I have put nothing else but only "light" in this tank for 2 months now, and they are still there. There's also a remnant colony of cherry shrimps that is solidly trying to re-establish itself after weeks without any witnessing. And now with berried ladies swimming around.
The water is not good. The pump is about to jam and my patience with this setup has vanished. And will tear it off...
This is where snail can drive me to. The only bonus I'll get from it...
A lot of "possibly recoverable" java fern babies... Full of snails.