HD-80 on concrete or ?

[Guest rfitz]

I have a few patios to wash in the near future but I dont have or

really want to purchase a surface cleaner at this time,

has anyone used HD-80 on concrete, or oxilic acid, ?

if so, how did you mix, dwell wash etc.. the concrete,

I do have a hot water unit, 3500PSI 5.6 GPM,

any help would be appreciated...

THX

[Beth n Rod 1,279]

Rob,

What's on the concrete? If it's grease or oil, HD-80 is the way to go. For General cleaning you can use the EFC-38. Brighten with oxylic or citralic afterwards. Keep the dwell time short on both. Mix at 4-6 oz. per gallon...let dwell for about 5 minutes. The acid can etch so be careful. Better to use the citralic than pure oxylic on the concrete to help avoid it. Rinse thoroughly.

Beth :)

[Guest rfitz]

Hi Beth,

The patios have your typical stains, dirt, mold, rust stains from

patio furniture etc.. should I use hot water to apply or rinse with

the EFC38 ? Also, I want to avoid streaks when washing with my gun

so maybe about 700-800 PSI ?

[Beth n Rod 1,279]

Rob,

EFC-38 will work on all of that but the rust stains. You might have luck with the Citralic on the rust, but go full strenght. If that doesn't work you will need Oxylic.

You shouldn't have streaks. Hot water is best on concrete. After you clean with EFC, locally apply the acid to the rust spots left by the patio furniture. Adjust the dwell time according to the amount of stain present. A nylon bristled brush may help to agitate the surface. Wash 700-1200 PSI, and rinse the same. Depending on the PSI of the machine, you can use a 15 degree tip and adjust the distance to keep it localized accordning to the stain present. For the main areas use a 25 or 40, when ever works best with your machine. Also suggest cleaning the whole patio first then go back and hit the stains for a better result.

Hope this helps.

Beth & Rod