rust on stucco

[clean streak 14]

i had a call just to remove the brown stains from well water off the side of a cream color stucco house any suggestions? should i use oxalic? thanks

[Firedkm 14]

If its rust that should to the trick.

[John Orr 206]

Oxalic will work fine. Apply and re-apply as needed. Do not let it dry on windows as it will etch. Bring enough to spray areas adjacent to the stains as frequently there will be a "haze" of rust over a much larger area. You may not notice until dry and viewed from a distance. Been there/done that.

[clean streak 14]

since oxalic takes like an hour to start to work and when i use it on concrete i dont rinse it off should i do the same on the house, cause if i spray it on and let it sit for an hour its gonna be dry. thanks

[Firedkm 14]

If its taking an hour for it to work I think your solution is to weak. How are you mixing it?

[John Orr 206]

Dale is correct. You should see results almost instantly, certainly within minutes.

[clean streak 14]

1/2 pound per gallon of warm water. ow should i mix it and should i rinse it off

[Firedkm 14]

1/2 pound per gallon of warm water. ow should i mix it and should i rinse it off

That should be working for you in less than an hour. I use a bucket and stir the the solution before using it. The water will absorb only so much so you may still have crytals or powder left in the bottom. Dont be shy about applying to the surface. I very rarely rinse it off.

Where in Blackwood do you live? I work that area alot for my full-time job. Maybe we could get together and compare some notes.