Does any one know how to get this stuff off?

[Stephen01]

Does any one know how to get this stuff off ?
The white stuff on the bricks

[AUSSIE]

Yes…

[Bigbendwashpros]

First guess would be calcium/hard water stains if it’s not paint runoff

[Stephen01]

What do you recommend I think it’s run off from the roof. What would you use to remove runoff and what would you use to remove calcium?

[Stephen01]

What would you use ?

[DJPWS]

“Calcium”