I have gallons of wd40 and a couple of hand spray bottles in the shop. Use them for tube bending, drill lube, etc.
When I know I'm going to be in the mud, I have been known to spray a thin coat on the bottom half of the body, and undercarriage. Mud simple slides off. What little sticks, just comes off with a low pressure garden hose.
Mud has always been love/hate for me. Flinging mud responsibly (from a tread lightly perspective) is hard to beat for mindless fun in a wheeler. Cleaning it up sucks any fun out of it. Kind of like a hangover kills a fun night barhopping. A little "cleanup lube" makes it enjoyable, even the morning after!
Wd40 works very well.
Veggie oil/olive oil may be more environmentaly responsible.