Stain window?

1

Doing a school the whole place school, baseball, softball football// under the windows this stone… there are 12 of them… Most cleaned up 2 did not…
what do you think this stain is why it will not go away>>
what can I put on to clean up??

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2

Did you try acid?

3

Never done no acid…

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4

Looks like calcium, muriatic acid should take that off, but might damage the paint…

Edit: i thought you meant the white stripe on the bottom, i read it again, you’re talking about the Stone sill.

Not sure what stain you’re talking about, but if it’s that white spot in the middle, looks like paint spilled and they wiped it with a wet rag

5

Look at the first pic you see the brown?

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6

Try oxalic and see if that will remove it

7

This is how they all looked before I washed them!
speaking of is that white calcium, I bought some stuff ideal from here $60 a gallon and it did not work???

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8

3 people have said acid. It’s lime talking to a thanksgiving turkey and expecting it to reply

9

Acid for the white stain? I got u and others on the other with acid?

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11

Lol… interesting location of his eyes.

I may use that pic for business shirt