Greetings from South Texas!

Had a fiberglass pool installed less than a year ago and I am very happy with the results. Water chemistry is on point as well. The issue that I am having is that after the concrete and grout fully cured, I noticed some white streaks that appear to have leached from the grout onto the side of the pool in various locations.

Any idea as to how I can safely remove the unsightly stains?

Thank you in advance for any advice.

Brian