First Soak and Manual Scrub — Scrub the steps
Part of project
How to Clean Mildew and Algae Off Outdoor Steps · Step 4 of 7
In this video
Let the applied chemical mixture sit on the concrete surface for approximately 10 to 15 minutes. This allows the bleach to effectively penetrate and break down the moss, algae, and accumulated dirt. After the soaking period, attempt an initial rinse with a garden hose. If significant grime remains, use a standard household broom to vigorously scrub the entire patio surface. The chemical treatment will have softened the contaminants, making them much easier to remove with manual brushing, which lifts the embedded dirt and algae.
First Soak and Manual Scrub — Scrub the steps
Part of project
How to Clean Mildew and Algae Off Outdoor Steps · Step 4 of 7
In this video
Let the applied chemical mixture sit on the concrete surface for approximately 10 to 15 minutes. This allows the bleach to effectively penetrate and break down the moss, algae, and accumulated dirt. After the soaking period, attempt an initial rinse with a garden hose. If significant grime remains, use a standard household broom to vigorously scrub the entire patio surface. The chemical treatment will have softened the contaminants, making them much easier to remove with manual brushing, which lifts the embedded dirt and algae.