Is Green Algae Making Your Front Walkway Dangerous? Signs It's Time for Power Washing Green algae on your front walkway can create slippery surfaces and increase the risk of slips and falls. Dark green patches, persistent moisture, and discolored concrete are signs it may be time for power washing. Remove stubborn buildup, restore your walkway’s appearance, and keep your outdoor spaces cleaner and safer. For More Info - https://jamescarter78.livejournal.com/3745.html?newpost=1