What is the A350's procedure for stained cockpit windows? Recently I read of this Ethiopian B737 incident at Dire Dawa on Jan 9th 2020. The aircraft flew through a swarm of locusts, which didn't cause any significant damage, but it rendered the cockpit windows completely opaque. So it clearly can happen.

Now on most aircraft, including B737 from that incident, the cockpit side windows can be opened and provide enough forward visibility to land the airplane from basically any available instrument approach.

However, A350 does not have any opening window that could be used, and Cat IIIB approaches that can be executed without any visibility are much rarer than just any instrument approach, so none may be available in range.

So what would the pilots do?
I am not sure if this applies to modern jets, but pilots of the past were sometimes landing "sideways" by using https://en.wikipedia.org/wiki/Slip_(aerodynamics). That provided some view from the side window.

I believe one example of that could be found in "Fate is the Hunter" by Ernest Gann.

Also general aviation pilots sometimes use this technique if the windshield is iced over.