Home Depot Discoloration multiple Vinyl Windows Glendale Arizona

Purchased several Windows & sliding doors from Home Depot.  They were manufactured by Solar Industries.  New house plan called for Aluminum Windows, but Home Depot suggested Vinyl Windows by Solar Industries.  We were concern about Arizona Sun exposure and discoloration by UV light.  Home Depot and Solar Industries assured us that there won't be any dioscoloration.  Unfortunately shortly after installation, they started discoloring.  It is apparent the fixed windows discolored more than the sliding windows, which translated that there is difference between the vinyl that was made for fixed windows vs. sliding doors.  Also the more sun exposed sides showed more discoloration.  

Although we did not know Solar Industies, we were assured Home Depot will stand behind their supplier, vendor...and make things right.  Instead their response at one point was "you get what you pay for."  As if I was not furious enough, this inapproprate response topped it all.

Now Home Depot, Solar Industries and Royal Windows who allegedly supplied the vinyl to Solar Industries are all pointing at each other.