Please choose the correct solution to the question: After removing old paint from the concrete surface of a pool, how should you then clean the surface off?

Solution1: Clean it twice. First with an acid wash mixture of 5% water and 95% muriatic acid, followed by tri-sodium phosphate (TSP) to neutralize the acid and remove dense areas of oil or grease. Rinse it completely with pool water.

Solution2: Clean it twice. First with an acid wash mixture of 50% water and 50% muriatic acid, followed by tri-sodium phosphate (TSP) to neutralize the acid and remove dense areas of oil or grease. Rinse it completely with fresh water.

Answer format: solution1/solution2
Answer: solution2