How to remove battery-acid stains from a concrete floor
Q: How can I remove a battery-acid stain from a concrete garage floor? It was caused by a golf cart.
A: Because acids attack concrete, the affected area may be darker and altered in texture, and that limits your options, said Terry Collins, concrete construction engineer with Portland Cement Association.
One approach is to treat the whole floor with an acid wash to stabilize the color and texture. Basically you’ll be removing a small amount of the surface so it all looks the same. Typically, this is done with muriatic acid, and it might be best to hire a contractor. If you feel confident about doing it yourself, be sure to wear gloves, eye protection, long sleeves and pants.
If you can live with the texture change and just want to remove the dark color, Collins suggests that you try treating the area with household chlorine bleach. Some people have successfully treated dark spots on concrete with diammonium citrate.
Most Read Life Stories
- Upscale dining deals: Dinner for two and bottle of wine for $30 at Seattle's revered Lark
- Seattle’s last buffalo soldier, 98, doesn't want black regiments’ history to ‘fade out’ WATCH
- 13 latest Seattle restaurant closures — with eviction notices, sudden shutdowns and more
- Feeling a little chilly these days? This French bar/restaurant has the best hot cocktails in Seattle
- In Kenmore, Seaplane Kitchen soars to lofty heights with delectable pizzas and modern American flair
Free publications on removing stains from concrete can be downloaded from www.cement.org (click on “bookstore” and search for PL861 and PL961).
Fix It is an occasional feature. Send questions to email@example.com. Sorry, no personal replies.