Keep Walkways From Getting Slippery With Algae

In Florida shade and humidity, sidewalks and patios grow a green algae film that's slick as ice when wet. Somebody eventually goes down on it. Keep ahead of it.

How to handle it

1. Scrub the area with a stiff broom and a solution of water with a cup of oxygen bleach (sodium percarbonate) per gallon. It's gentler on plants than chlorine.
2. Let it sit 15 minutes, scrub again, and rinse.
3. Trim back whatever is shading the spot so the sun can dry it. Damp shade is the whole problem.
4. Repeat at the start of rainy season and mid-summer.

A pressure washer works too, but keep the nozzle moving and don't blast the surface into pits — etched concrete grows algae back even faster.