Cleaning sandstone?

(2 Posts)
Fluffycloudland77 Fri 11-Nov-16 15:52:01

Our windows have sandstone windowsills, or beige concrete confused but it's got green algae staining on it.

I can't find anything to clean it though. What can you put on it to kill the algae?.

irie Sat 12-Nov-16 07:56:30

We have a sandstone patio that's always going green, DH jet washed it... not sure that's an option for your windowsills though

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