Water spots on GALS enclosure

So I need advice on how to get rid of all the water spots on my GALS enclosure. It’s an old fish tank that works really well for her. However when I mist it dries and leaves loads of water spots. I do a soil rotation and clean off the slime and sides once a week with warm water and it’s all fine but the water spots are getting really bad and no matter how much I scrub the sides when they eventually dry they are still there! They’re getting so bad I can barely see in there now. Any tips on how to remove them? Thanks