We also have a screened in porch. The wall frames are painted wood and the floor has clear Arborcote on it. I use Murphy’s Oil wood soap to clean the porch. Also might add that I learned the hard way to wait until after the pollen burst which usually occurs mid to late May.
We have a screened in porch. Between winter and spring, there's a lot of dirt and pollen that accumulate both on the wooden window ledges and floor. What's best for safely cleaning wood in this instance?