Steering wheel control button

Can’t figure out why it’s bubbling like this.
[img alt="Same car
"]https://cimg3.ibsrv.net/gimg/www.mbworld.org-vbulletin/2000x1504/img_3375_7f94dede7b54e9dda3cf06b6bee3e90bfa851a65. jpeg[/img]
Same car




This is the tip of the iceberg... same thing is happening to the engine bay: all the rubbers are aging.








