One of our housemates decided to pour battery electrolyte (which is 30-40% sulfuric acid) into a motorcycle battery on our back porch next to our laundry washer and dryer. He did so extremely sloppily, and we don't know exactly what he might have spilled the acid on.
Is the acid safe to touch after it dries, or is it still a safety hazard?
If it isn't safe when dry, what can we do to neutralize the acid? I know baking soda can neutralize acid, but I'm not really sure how to easily coat an entire porch in baking soda.
My boyfriend suffers from severe, debilitating OCD with a chemical contamination obsession, so this is an absolute nightmare for him. Thank you in advance for any help you may have!