Hardi-siding grout splashes

[sweetwater]

This project has been hanging around for a couple of months, and finally ready to tackle it again. Owner had to pave the road in front of their home to keep the dust down, now thats done, so we've to to give it a final wash.

First issue I've had ( and solved) is with the "clinginess" of the road dust on the siding. Pressure alone won't remove it, it takes a manual brushing to remove the haze.

Now the pressing problem is with the hundreds of grout splatters & smears left by a sloppy paver contractor. Any ideas on the best way to remove them? Pressure, soap, and brushing proved to be fairly ineffective against them.

Material is a color impregnated (not painted) Hardi type material. Builder would like to avoid touch-up painting if possible since this is a non-painted surface. I would like to avoid pigment damage to the siding. This one has got me scratching my head.

 

[extremecleantn]

I have never seen anyone be able to remove concrete on hardi board without messing it up, its a very easy material to destory then you would have to pay to replace it. Better to walk away, the contractor can always change out the sections that have the concrete on it.

 

[Art Oliveri]

The DOT has a Chemical to remove cement from cars. I'm not sure what it is. But you could try something like this. It may work. http://www.topoftheline.com/cement-concrete-remover-auto.html

 

[Guy Blackmon]

If memory serves correct, hardi-board is cement based so anything you use to take off the mortar will affect the hardi siding..........this would be a job that I would pass on.

 

[Art Oliveri]

Good point Guy

 

[sweetwater]

Passing on it is not an option...builder sends me about 15K a year in business. Every new house he builds he has washed before turning it over to the buyers. Its possible it just can't be removed and he must paint.

 

[Doug Rucker]

Passing on it is not an option...builder sends me about 15K a year in business. Every new house he builds he has washed before turning it over to the buyers. Its possible it just can't be removed and he must paint.

Deal with a lot of Hardi here. No way you can remove that with out scarring it. you are correct ray. Not touching it up, is not an option.

 

[JoshM]

sponge soaked in vinegar soak the area and let sit for awhile the vinegar acid will brake down the concrete once it has soaked in use more vinegar and hot water with a sponge and rub till it comes off. Hope this helps. GOOD LUCK.