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Ask Dr. Laundry

Ask Dr. Laundry

Removing mildew from sidewalks

By Dr. Laundry October 8, 2012

This summer, mildew built up all over my sidewalk. How can I use Clorox to remove it?

What a great project to tackle at the end of summer mildew buildup! For mildew removal on concrete (such as a patio), use a dilution of 1 cup Clorox® Regular-Bleach per gallon of water.  Here’s how to proceed:


  1. Protect nearby plants and grass by watering area thoroughly before and after product use.

  2. Hose patio to remove loose debris.

  3. Apply the solution as needed to keep the area wet for 5 minutes. Brush as needed to remove stains.

  4. Rinse thoroughly and avoid excessive runoff near plants.


Good luck with your clean up!