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Getting Rid of Moss and Algae on Concrete

We have had a lot of rain these past 6 weeks in Connecticut. My front concrete steps are very green. Is this moss or is this algae? How do I get rid of it? Thank you.


By menopause from Suffield, CT


Getting Rid of Moss and Algae on Concrete

Don't know which it might be, but a pressure washer will get rid of it and make your steps look new again. (07/19/2009)

By marisa0407

Getting Rid of Moss and Algae on Concrete

Household bleach mixed half with lukewarm water and a teaspoon of dawn dish liquid in a gallon plastic container applied by pouring and brushing with a push broom on a sunny day. Test the area you spray before rinsing off all of it. You may have to leave it on overnight if heavy growth.

Let it dry in the sun then rinse with a hand held pressure sprayer nozzle. You'll have to put in a bit more work, but it's much cheaper than renting a machine that doesn't do that much better. Wait until the sun is down more, still light enough to rinse off. I have done this several times and never had a single problem with plants or grass, but if large leaves are nearby, toss a cheap painter's drop cloth over whatever you're rinsing near it. Move it with you to cover any plant you need. We had excellent luck with it.


Although I didn't try this, the paint store (Sherwin Williams years ago) had a 'mildew retardant' packet for paint additive that I would have used along with it and which was available in a small packet. (07/21/2009)

By lyndagayle62

Getting Rid of Moss and Algae on Concrete

Be environmentally safe and thoroughly spray (not pour directly because of run-off) with vinegar. It will kill whether it's moss or algae. Vinegar also kills even weeds in just a matter of hours.

Be sure not to let the vinegar spray get on any of your other plants or tree's leaves by spraying on a non-windy day and/or use a large piece of cardboard to keep the spray from hitting any plants next to your steps!

It also works best to do this on a warm and/or sunny day. :-) (07/21/2009)

By Deeli

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February 4, 20170 found this helpful

Try this if you prefer not to use water, after all water is a big part of the problem, isn't it? LOL. Spray Hydrogen Peroxide then spread some baking soda over it and let it sit for a little while Then spread some kitty litter (absorbent works better) to help sweep up, kitty litter may not work as well as an absorbent but it's a lot cheaper and helps it sweep up nicely.


FYI - I do live in California so water is not to be wasted but even if water is not an issue for you, this helps to keep the yucky stuff contained. Good luck

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