Some lamps have removable sockets, but these don't; the sockets are swaged onto the housing—a primary reason being they're down in the splash zone and removable sockets would have made more cost and hassle because of required seal boots, etc.
What you're looking for is called an ultrasonic cleaner. They're all over eBay, Amazon, etc. Very, very useful.
See
this post for info on repair and upgrade of lamps like this.
