Xperia Z5 Compact color problem

I love my phone. I'm very satisfied with the performance, battery life, camera, audio and the design. but I have problems with my z5 compact color. I bought the white color because it looks good and I like it. but after a few months after purchase, the phone turn yellowish (the side of the phone) even when I use a case it still getting yellow. is there a solution to make the color becomes white again? I've tried to wash it but doesn't give any effect. if only I had more money, I want to buy this phone again with another color.

 

You have tried the color balance in settings? Sorry for my English I'm French

Envoyé de mon E5823 en utilisant Tapatalk

 

not my screen, but the color of the body phone. all arround the body. first time I use this phone it was white, but now its getting a little bit yellowish. sorry for my english also hahaha
thanks for your respon