LCD displays have expensive and somewhat fragile anit-reflective coatings on the surface. Harsh chemicals can damage them. I'm sure Raymarine could replace the screen, but it will be fairly costly. What some people used to do with the old E series Raymarine displays (which had very fragile coatings) is continue to scrub the display until all the coating was gone. You will get more reflections, but the blotchy and streaky appearance will be gone.
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