The real question is how old and how much sun have they endured?.....also are they vertical or laid nearly flat?
New electronics usually have a certification for a direct hose test....they certainlty take heavy rain just fine.
However, as they age, the seals around the screens historically deteriorate, crack...etc.
If laid flat enough for water to pool on the screen...that can be bad..
But if relatively new, a misting spray, immediately wiped off should do no harm.
As to the plugs in the back, as long as they aren't loose in the case, they often benefit from a touch of mist, followed by a q-tip swab bing with a little water dispersing sprayed in before reassembling. Or skip the mist and just swab with some water displacing fluid.