Pour some white vinegar into your bucket, dip in your scrub brush, and start scrubbing the mold. Vinegar alone will kill mold about four-fifths of the time and will almost always be enough to kill algae. For a small infestation, put away the bucket. Put a little vinegar in a spray bottle instead, apply it that way, and then scrub.
Empty your bucket of vinegar, rinse it, then fill it with water. Use a sponge to rinse off the infested area with fresh water, then dry it with a rag. If you are doing a major exterior wall-cleaning job, use a hose instead and allow the sun to dry the wall.
Return with a bleach solution if vinegar was not sufficient to kill the mold. Two cups of bleach per gallon of water will be enough to disinfect the wall. Scrub with the stronger solution, rinse and dry as you did in Steps 1 and 2.
Things You Will Need
- White vinegar
- Spray bottle (possible)
- Scrub brush
- Bleach (optional)
- The reason for starting with vinegar is because it is milder and less toxic than bleach. You won't create chlorine fumes inside your house or kill garden plants with dripping runoff outside your house. If these are not concerns, go directly to the bleach solution.