I would do two washes.

Use pure deionized water.

Take the entire thing apart snd gently wash the electronics with that to get the dirt off.

Before it dries use hydrogen proxide on the electronics and let it sit for like 2 minutes.

Hydrogen peoxide kills cat pee smell and everything.

Before it does against submerge and rinse well with deionized water.

Let air dry in dust free area.

Now take a tub and use soap water mix on exterior scrubbing.

Rinse off.

Take a lot of hydrogen proxide and let the exterior casting soak for a few days it might remove any aged yellow plastic look.