Hello. I'm hoping someone has some advice for me. I have a gunite pool built in 2011. The first few years I had it I really didn't know what I was doing and am still limited in my knowledge and rely on the local pool supply stores to help me keep things in line. My issue is that I have a lot of stains in the pool from poor chemical management. The local pool store came out and said an acid wash would not get the stains out. Is my only option to re-plaster the pool?