I have a spray bottle filled with a diluted Star-San solution that I used infrequently. Now I'm back to using it on a regular basis and it has a strong scent that is reminiscent of Windex.
Is it still safe to use? Could it just be reacting with the plastic of the bottle? The bottle is a standard all-purpose HPDE sprayer which should be fine.
Edit: It's about a year old and the pH is reading quite high at 7-8.