That Arizona sun acts like a magnifying glass and burns (and warps) your cluster face. Probably replacing is the only choice I would think. I noticed a haze and then burn areas from the constant sun on my Lexus headlamps parked outside everyday for a few years in the Nor Cal sun. The sun in your area is less forgiving than here. It's Africa hot where you live. Tarzan moved from Arizona to Africa because of the heat if that tells you anything.