After taking a closer look at him and doing some digging around the webs, i’m 99% sure it’s cataracts. Except for the white, it doesn’t look like a typical eye injury, it looks almost exactly like the pictures of cataracts i’ve seen on the internet.
As for cleaning the bottle, i’ll try out your tips and see if it gets clean enough for my liking.
I do have one of those brushes, however it doesn’t fit and pretty much nothing else does either, which is concerning since it’s so crusty.
I might just use a bowl instead, if it doesn’t get clean enough.