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Spilled wood stain on concrete7/13
I was hired to seal and stain a client's pergola. A sub accidentally knocked over a bucket of wood seal onto a concrete deck. The stain is olympic advance elite, which I believe is oil based. Bleach and pressure washing lightened up the stain a little but it's still there. The homeowner is furious. Any advice on what might work to remove this?
Try muratic acid. I've used it to clean stain and oil that dripped from my box van onto concrete pavers. Keep a hose or bucket of water close by to rinse it off.
How big is the patio? What if you stain the whole thing to get a uniform color? I would say the chance of removing the stain totally is zero to no chance.
Muriatic acid will etch the concrete, and most likely result in most of the stain sinking deeper over this large an area.
Assuming it is just the transparent stain like https://www.homedepot.com/p/Olympic-Elite-1-gal-Mountain-Cedar-Woodland-Oil-Transp
The best you are gonna do is a very large amount of something like https://www.amazon.com/Chomp-Remover-Concrete-Grease-Driveways/dp/B0046O5YMA
Keep reapplying until you are done or it's not looking any better.
Beyond that, the rest you are likely to need to grind out if it doesn't look good enough.
Nothing will get it completely out. Your only option is to stain the entire concrete surface with some hand work/blending in the spill area. You cant get any stain completely out of concrete... period. If its stained its too deep to get out.
This is definitely not right, i've gotten non-pigmented stains completely and totally out of concrete before.
Perhaps you have more information than I do but these stains are pigmented in-house at the home center. I dont honestly think you would ever even be able to salvage large non-pigmented spill on a fussy job but maybe you have more time than most.
Yeah, it depends on if it's the transparent one or not.
I agree you are not going to get the pigmented version out.
As for whether it's worth doing, i think it may not be worth doing, but it's at least possible :)
Better check how good of insurance that sub has while you are at it. I'd also suggest talking to your lawyer. This could get expensive if the customer is intolerant of any discoloration.
Call a commercial masonry restoration company, they deal with this stuff daily. Zep makes some driveway cleaning chemicals, but I'd leave it to the pros so you don't make anything worse or end up on the news for an environmental disaster.
I just completed my own concrete patio and pergola project, at great expense. If one of the subs spilled stain on my concrete I would absolutely insist on either a perfect repair or complete removal and re-installation of both the pergola and patio. I, along with most of you, are held to those standards everyday by my customers. I would expect nothing less of the subs that I hire.
Hopefully you guys took care of it free of charge. When it's one of your subs fault, it should come out of his income.