Regardless of what the remote access test says about it being available, I had to manually port forward to fix this same issue.

Seriously, can’t get those 15 minutes back.

Whenever you do get it clean, treat it with RainX or similar. We do that every few years and squeegee after each shower, our glass is spotless after 10 years. Our water is super hard too, saw the house next to ours which was built at the same time, disgustingly opaque with scale.