Discoloured watch strap

The really light color silicone bands are hard to keep pristine, for sure. Try a Mr Clean Magic Eraser, but if you can't clean it, there's likely nothing you can do about it. Bands can and do discolor and there's no warranty on that as it's a wear and use thing. I personally avoid the really light colors. And I have many bands for my Apple Watch as I tend to change bands out a lot depending on my mood and what I'm wearing for the day. You can buy bands on Amazon, which aren't expensive at all.

Which band are you referring too? How long have you owned it. The reality is watch bands are subject to wear and tear and can even wear out.

<lobsterghost1 beat me to it!>