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Not sure for some reason it's not coming of the 3d printed guards.I use a toothbrush on most stuff, but a vinegar soak (same deal with citric/muriatic acid) is helpful for coralline and mineral buildups too.
As a general rule, algae isn't going to just melt off completely unless you use pretty potent stuff. Scrubbing is the right solution unless you can't for some reason.
It's almost like turf algae. I mean it builds up overtime. I am going to try a different brush. Somebody mentioned to use Bleach with water but little afraid Bleach contaminating the material.What kind of algae are you having that much trouble cleaning off?
I just use a toothbrush under sink faucet for my 3D-printed (PETG) nem gaurd and it scrubs clean easily,,, but I do it usually weekly.
For tougher stuff that's been there longer, I would've said citric acid (about a cup per gallon of tap water) but you already tried that.
Ok I will try 50/50 bleach on one of the units and go from thereI forgot to say I’ve used the bleach on my 3D printed random flow generators as well. It’s really not too hard to get bleach off of things. Either let it completely air dry or give it a good dose/soak in dechlorinator and you should be fine.

