Im sorry to say this to all you owners, but it isnt dirt, and it isnt something you can clean
Its clear to see that aswell as the area's getting darker you can also see that small grains of clour are coming off!.. I have seen 5 HTC 8 X's in the last few days that friends and family all own, they are all exactly the same, and this is after one month! can you imagine it after 6 or 12 months!???
Would you find this acceptable buying any other product that after one month the corners which were nicely coloured when new are now darkening and there are speccles of colour coming away?
To me its totally unacceptable and you cant tell me HTC did not see this when doing their extensive pre-production stress testing, it would have gone down as a known issue pre-production which if youd ont know all products have, someone would have signed off on it being an acceptable issue and to continue production
its ridiculous!
I have replaced both of mine for Nokia's now, and even if you dont think it now (after ONE month), I guarantee each and everyone of you will want to complain and get it replaced in the months ahead, unfortunately you only get 28 days to get it replaced with yoru carrier under the fault replacement promise, so i would urge you all to get rid asap and get a different phone that doesnt have a colour defect!
Anyone that says it hasnt got a colour defect, come back here in 6 months and tell me you still cant see it.. its very clear it has!