I'm not sure what brand a model 304 falls into in the Keystone product lines, but we've got a 2014 Cougar XLite and just like bobbecky's trailer, ours is as shiny as when it was new. I'm not sure how you're washing it, but with a 4 time occurrence, I'd be looking at something you're doing rather than a mirror failure. Yours is the first one I've heard about failing as you describe.
Let us know more about how you clean it and what your dealer says.
And, welcome to the forum.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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