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This is page 1 of 1 (This thread has 2 messages.)
Our windows have sandstone windowsills, or beige concrete 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?.
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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