My cousin purchased a pearl about 2 weeks ago, and I've had mine since Sept and have Rogers os on a tmo phone and he hasn't updated yet.
His trackball is a blueish color all the time and mines a dull yellow, why?

because yours got dirty and yucky. It happens to all of them and fast i had mine a month and its was brown/yellow looking. I work in the construction field so I didn't expect mine to stay white for long. They are pretty and white when new I must say though...

Mine is the same way, i clean mine with a cotton swab with cleaning alcohol on it, works like a charm.

I've also heard that scotch tape works well for this... Haven't had mine long enough to try it, but makes sense that it would.

I'm going to go on a cheetos binge for 2 weeks so I can have an orange trackball.

how is everyone's trackball getting so dirty? just clean your hands once in a while and you shouldn't have a problem

I use paint thinnerrr ;) hehe mine is as white as a PEARL LOL