Every RV with that type of plastic used for anything, discolors quickly. Especially in the Southwest. We always use some type of film or sunscreen on all skylights. Shower discolors within a year anyway. Doesn't really bother us. Just the nature of the beast. Just don't understand why the manufacturers insist on using these type of plastics. Well I do, $$$$$.
Some friends didn't like their discolored shower, so they painted with plastic paint. Looked great for about a year, then started coming off. Yuck. So we just live with the slightly yellow color
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Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder