North side front steps green from lack of sun, what can we do?
heavily stained limestone front step are green and black from lack of sun. How can I clean these steps. I have already used acid on them and scrubbed the with cleaning solution. Any ideas?
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email Ask This Old House. They will maybe have a suggestion. They may even come help.
I found this when I did a google search "You can make a poultice by taking 3/4 cup of flour and adding little amounts of hydrogen peroxide until you have a paste. Apply the paste and allow it to dry, which may take as long as a day or two." There are sealants available once the steps are clean.
If you don't have a power washer, they are cheap to rent for a day. I power wash the conceete steps, walk way and driveway and then you can seal them. It is not hard and it is amazing how the concrete comes up like new!