How can I fix the yellowing on white objects?

I have 2 ikea linmon tables and just recently I have been experiencing some yellowing on my desk and on my peripherals. This just started and I’ve had these peripherals for a long time in the same spot. What could be causing this? This is really annoying and the yellowing is really hard to get off. Could it be my PC, light bars? I’ve had everything shown in the picture in the same spot for months and just recently I’ve been experiencing yellowing. I clean it and it feels like it never goes away. Any suggestions?