Posting here since this steering wheel is shared across a number of Porsche models. This is in a 2011 Cayenne but I believe this wheel is also in 911's.

The steering wheel has had this discoloring since I bought it. I'm guessing the previous owner spilled something.

Does anyone know where I can find instructions or diagrams on how this wheel disassembles? Hoping I can fix this by taking it apart and cleaning it, or repaintinh if necessary.

 

that foggy stain behind the display window means it trapped water before
hard to remove even you remove the trim and get there

check this video, from 5:00

 

The trick to removing the bezel is to heat the back of the wheel with hair dryer.

Remove the steering wheel from the column first. As the video shows, the bezel attaches to the wheel with plastic posts. When heated they slide out easier. You need to pull by hand, don't try to pry it with a screwdriver or you'll break something underneath.

Hope this helps

 

That video helped a lot. But I'm still wondering if the inside of the clear plastic can be accessed? It looks like there are several screws that need to be removed to separate it? Has anyone done this? It seems like a lot of work...