[FastEddie26]

I have some wasp's nest and some bug carcases, etc. on the ceiling of my front porch.

Is it safe to pressure wash this gunk off without getting water into the ceiling somehow?

 

[joecaption]

Since no one here knows what the ceilings made of kind of hard to say.
Might want to play it safe and just use a hose with a nozzle on it and a scrub brush.
Why take the chance of blowing some paint off.