I have been using TSP substitute + a some bleach to clean the wood siding on my house prior to painting.
I need suggestions on how to protect my deck. I tested the product on an area, and even if I wash it off immediately, it will remove some stain (and it might possibly damage the wood, too?). Even if I cover the entire deck with plastic, some of the TSP substitute might get under the plastic. The boards nearest the house, where the water runs off, will be the hardest to protect.
Is there a different product that I should use? FYI The house has heavy chalking, but little mildew.