Yes and no 😀
Here’s my saddle brown before the washing machine. I’d already sanded off the the wax finish and added some oil to speed up the patina process. I thought it looked great and certainly improved the grip of the case.
Here’s my case after a run through the washing machine (along with all my watch bands and silicone case).
I think it looks great (looks better than the photos in person) and the wash seems to have taken off the oils that I put in there via my hands and oil I’d purposely put on it it.
I dried it off with a hairdryer and it went back to the light colour. Also note that wash has improved the feel of the case and made it really grippy.
Im glad I did it, remember your results may vary and don’t go in expecting perfect results.