How did you get it apart and 
Yeah. Didn't take any pics :shame:
Took the switches out using a combination of yours & other's posts about removing the airbag. Then just pried the back off the switches and everything falls out. Easier done than said really. More detail as follows:
FIRST, either disconnect the battery, or remove the airbag fuses, and wait 5 minutes before proceeding. An airbag in the face can ruin your whole day.
OK, so this may be easier to understand if you can visualize how the airbag is attached. The airbag has two hard cylindrical posts at the back, that fit through circular cut-outs in a plate attached to the wheel hub. There are two thick spring wires running vertically down the back of this plate, which engage in slots in the posts and hold them, and hence the airbag, in place. See picture below.
There are two small holes, one one either side of the rear of the steering wheel hub that allow access to these spring/catches. First get the steering wheel roughly level (i.e. wheels straight ahead). Then take an electrical screwdriver or similar, and insert it into one side hole with the blade horizontal - in line with the steering column. Prod & feel around inside the hub until you feel the post on that side and then move your prodder just below the post and again feel around until you find something springy, this will be the spring wire. Push against the wire to move it back away and out of the slot in the post. You don't need a great deal of pressure - it's not a very stiff spring - so if you feel too much resistance you're not in the right place. Pull on the front of the airbag on that side as you push against the spring and it will release and come out a little way (still held by the other side post & spring wire). Stick a folded-up paper napkin in the gap to hold it open and repeat with the prodding on the other side to release the second post.
Once both sides are released, you can move the airbag out of the way. You do not have to disconnect it, just move it out the way without pulling to hard on the wires. Then you can see a Torx-head screw on the inside of each switch assembly. Remove the screw for the side you want to fix, and the switch assembly will pull out. Disconnect the wire connector.
If you look at the switch from the back, with the buttons away from you, you will see that the back plate is held in with little tabs. Just pry at them gently with your electrical screwdriver and you can pop the back plate off. Once it's off, the PCB and then the rubber membrane can just be lifted out and cleaned.
UPDATE: Grabbed a bare steering wheel photo off an ICS eBay listing, updated with notes to help with the above:
[attachment=2]
