Is this lime scale? Can it hurt the frogs and how do I get rid of it without harsh cleaners?

[flybyferns]

Hi ,
You can mist with distilled water. Distilled will not stain the glass.

I would clean these stains with a spray bottle of distilled water, a single edged razor blade, and a damp cloth.

You don't want to do this 'dry', whereby creating a fine dust the frogs could inhale. Keep it nice and wet. I use this method every couple of months in my tree frogs enclosures. Works like a charm !

No chemicals necessary !

Lynn

I see you have auratus. I would remove them from the enclosure when you scrape the glass.
They are so shy and will likely be upset by you being in there that long.
Plus they have the habit of squishing themselves into odd places. ( you don't want any accidents)
They don't like their 'stuff' messed with.... either