Its powdery, white and I can't get rid of it. What is it and how can I get rid of it?

I have a large brick walkway that, during the winter, gets real slimy and slippery. Rather than have it steam cleaned every year, is there something, such as washing detergent or the like, that I could apply to the bricks and scrub them clean with a stiff broom? I live in Portland, Oregon, where...

I want to set up a fountain but ran into a problem. In between the fountain and the electrical outlet there is a 2feet walkway, is there a way I can run a wire under the 2feet walkway? When we bought the house, there was a landscaping light already installed, and I saw a wire ran under the walkway....

I am thinking about adding a front walkway, from the sidewalk, straight up through my lawn to my front door. ( Presently, you must walk up the driveway, then left along a walkway to the front door) Question. My front lawn slopes down exactly 25" from from the bottom landing of the front door...

I am thinking about adding a front walkway, from the sidewalk, straight up through my lawn to my front door. ( Presently, you must walk up the driveway, then left along a walkway to the front door) Question. My front lawn slopes down exactly 25" from from the bottom landing of the front door...