I have owned a small apartment complex for about 4 years. It has a lot of concrete: walkways, parking lot, and patios. There are many trees surrounding the complex and the walks have gotten progressively greener and blacker as the years have passed. I want to spruce the place up as I am contemplating selling it come springtime. Any ideas? I do not like harsh chemical, because there are many children and I do not wish to kill the trees and flowers.

Mac says: Try pressure washing, using just water and not chemicals. You can hire it done or you can buy one and do it yourself. It’s not rocket science. Since you plan to sell, you might consider hiring it done. However, the electric ones are not that expensive. It might be less costly to buy and try to sell it when you are done, unless you can find a place that rents them.