As far as a pressure washer there are seceral tips (ends where the water comes out, not items of advice) to use. At least the new ones; if you borrow or rent one, they may have only one tip.
If you are fortunate enough to get one with multiple heads there is the powerful one for concrete gradiated down to the least powerful for painted surfaces. If not, I guess you have to change the pressure by the amount of water coming into the machine. I've not done that and not even sure if it doesn't cause problems with the machine. If you use this method just remember that when you start, the pressure will be full force so you have to point the wand elsewhere when you pull the trigger.
There are cement sealers that can be use that should hamper the growth of new mold. Use several coats.
To: doit_yourself@yahoogroups.com
From: DoIt_Yourself@yahoogroups.com
Date: Wed, 23 Mar 2016 09:47:32 -0500
Subject: [DIY] Mildew/Stains on Concrete
If you are fortunate enough to get one with multiple heads there is the powerful one for concrete gradiated down to the least powerful for painted surfaces. If not, I guess you have to change the pressure by the amount of water coming into the machine. I've not done that and not even sure if it doesn't cause problems with the machine. If you use this method just remember that when you start, the pressure will be full force so you have to point the wand elsewhere when you pull the trigger.
There are cement sealers that can be use that should hamper the growth of new mold. Use several coats.
To: doit_yourself@yahoogroups.com
From: DoIt_Yourself@yahoogroups.com
Date: Wed, 23 Mar 2016 09:47:32 -0500
Subject: [DIY] Mildew/Stains on Concrete
I have a concrete patio on the north side of my house. It is covered by a shaded pergola in summer. The cover is off when it's cold out. Because of the shade the concrete now has patchy spots of mildew? on it. I also have a plastic sandbox on it for grandkids. Around the sandbox there is a dark ring of either dirt or I don't know what.
While roaming the aisles at Home Depot I recently bought Home Armor Instant Mold & Mildew Stain Remover. It's in a spray bottle. Well, I tried it and it did get the concrete a bit cleaner but dark spots still remain. Lots are about the size of a pencil eraser, many are larger.
Any advice short of using a pressure washer to get it clean? And once it's clean is there a sealer to be applied? Or wouldn't that help keep mildew off? The pergola has been up about five years. Before that I had no problem since it was sunny most of the time.
While roaming the aisles at Home Depot I recently bought Home Armor Instant Mold & Mildew Stain Remover. It's in a spray bottle. Well, I tried it and it did get the concrete a bit cleaner but dark spots still remain. Lots are about the size of a pencil eraser, many are larger.
Any advice short of using a pressure washer to get it clean? And once it's clean is there a sealer to be applied? Or wouldn't that help keep mildew off? The pergola has been up about five years. Before that I had no problem since it was sunny most of the time.
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Posted by: Ron Johnson <l0c0l0b0@hotmail.com>
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