Originally Posted by
Tom M King
The pressure washer cleans it so fast, that I doubt the wood absorbs any more water, to amount to anything, than coating it with some chemical, and then having to rinse it off. No worries about anything getting left behind to play with finishing later.
It's going to have to be dried some after either process in a low humidity environment anyway. One pass with the pressure washer blasts it right off, down to bare, clean, new looking wood, as in my picture.
It's not tannin stain. I have done the same with some that I had stored under a tarp too, and it looked like it just came from the mill, as does the siding that's had this treatment for at least four times in 40 years.
My pressure washer came from a rental place that was going out of business. They are a fairly common rental item, but I have no idea what they rent for. I bought mine 25 years ago.