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Handyman on Call

How can she get rid of a bird’s nest in an exhaust fan?

Q. My front steps are 8-by-8 railroad ties. They’re on the north side of the house, so they’re in the shade and don’t dry out after it rains. They get covered with moss or some other green stuff, but the real problem is that they’re very slippery. Do you have a solution?

FRED LEVY, Cambridge

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