What?
You guys don't have a climate controlled indoor place to clean fish?
I do, its called the kitchen sink. Just don't do it when the Wife is home!
I have a friend that built a 10X12 ft fish and game cleaning shed. It has a salvaged stainless restaurant style deep sink with sideboards with a disposal, small heat and cool window unit and a floor drain in the slab. Equipped with a wench to hoist deer for skinning also.
It did not cost much money to build, most of the stuff was used. It sure makes it nice.
I am like most of you. A gallon of Mosquito spray, a pedestal fan and someone keeping plenty of water on everything. I use a cheap plastic picnic table. It is not porous and cleans up easy with some bleach water afterwords.