Help : Remove hard water/saltwater stains

[Aquaman-22]

Anyone knows the best way to remove hard water/saltwater stains in my aquarium? I've tried using vinegar and a razor blade but this stuff won't come off!

Thanks!:)

[tanksalot360]

Depending on how bad it is, if it's coralline algae, a paint scraper might help. I've seen people recommend muriatic acid, barkeepers friend and even CLR. Please do your research if you decide to
go the chemical route.
Soaking the area in reverse osmosis water, dunking a rag in vingegar and laying over the effected areas can help loosen things up. And you may have to repeat a couple times.
Sometimes it's more effective to shave a little if the black frame away if the deposits go with it.
My 2 (5) cents.

[Aquaman-22]

Will try that! Thank you:)