Suggestions for Cleaning Scale

[GreenTerrorPool]

Hello All, I have tried lots on this scale, and just cant get off these pool tiles. Any suggestions on what would work best.
(see photo)
Im in South Florida.
thanks

 

[ajw22]

Spray a bit of diluted 5:1 to 10:1 muriatic solution on it to soften it and scrape it off.

Be careful you don’t damage your grout with the acid solution.

Rinse the area well with fresh water.

 

[GreenTerrorPool]

Thanks but I tried that and it didnt work