How to clean this?

[Shawn F. 14]

I began pressure washing my parents home today but ran into 2 problems. One being my new Hi/Low Pressure Nozzle only stays on high and the other is a stain along the bottom of the entire house that doesn't seem to come off. I used a mixture of 4.5 gallons of Clorox Outdoor bleach, 16 oz of Simple Cherry and 8 oz of F13 Gutter Grenade. I let this mixture sit for 5 minutes, scrubbed with a brush and no luck...

Any ideas what needs to be done here to remove this? It's along pretty much the entire bottom of the home and it has never been pressure washed (house is about 13 years old or more).

Thanks a lot in advance!

[chris francis 15]

try iron out from lowe's or if you pressure repair shop ask them if they get product call clear pink power.

[Shawn F. 14]

I will look into Iron Out, thanks a lot... Any other suggestions, feel free to post them!

[A OK Pressure Washing 14]

F-8 works good for rust. Click on the link.

Use F-8 to neutralize & brighten wood after the use of alkaline based strippers & cleaners. It can also be used to remove mild rust stains from concrete, vinyl siding and others surfaces caused by irrigation. F-8 is sold in 10 lb packages. - CHEMICAL

[Shawn F. 14]

Only thing is that it's not rust. It looks like it though but it's not. Think the F8 will work anyways?

[sadmemories20 14]

Only thing is that it's not rust.

[TNRoofCleaner 16]

It does not have to be rust, the iron in the soil is what gives it the red color and that is rust. Just not what you are used to seeing.

[attsux 14]

This is a natural stone pool deck that a contractor got tar on...I was able to remove it off of the granite and concrete..but it won't budge from this stuff...I used...purple power, krud kutter, kerosene, muratic acid, all with scrubbing, all with hot water...its like in the pores of this stuff..the stone seems very hard thou, it wasn't phased by any of these products or high pressure in my test spot..thanks for any help with this "grime"

[Rick2 42]

Maybe Goo Gone or BT200 might help.

[Shawn F. 14]

Paint thinner possibly?

[Pat Norman 18]

Shawn, Oxalic acid, two cups per fiver and brush it on. Iron out and F-8 are both oxalic acid products I think if you cannot find bulk oxalic. Try your local chemical suppliers.