They're both turning brown. Is there something I could use? WD-40?

 

1 -Not sure if this will work, but my wife uses Mr. Clean Magic Erasers for a ton of cleaning issues around the house; stove-tops, scuff on walls, bathroom, sneakers, etc. May work on your concerns.

2 - Meguiar's makes a full line of waxes and cleaners. Good products! Two options that might help you is their Meguiar #40 is a great product that cleans and protects. Does not leave a slippery finish. Meguiar #39 is a very strong cleaner. This should be used carefully and very infrequently. It will clean just about anything out of vinyl. Must be followed by a vinyl protectant.

 

I use lexol leather cleaner and the conditioner, on steering wheel and shifter while I do the seats. Honda/acura not the best leather.
Or water and a rag.
Used on 08 TL and accord seems to work ok.