Concrete is made with lime, which is alkaline, so the surface must be neutralized after using acid cleaner. Cleaners may use pH neutral, alkaline, or acidic formulas to chemically lift stains. In choosing an appropriate concrete cleaner, be aware that different cleaners act in different ways to banish stains, and they also react differently to the concrete surface. Be sure to choose a cleaner that is recommended for use on the particular spilled product: Enzyme cleaners can neutralize many volatile compounds, eliminating their negative environmental impact, and absorbent cleaners pull the spilled product out of the concrete. These products penetrate the porous surface of the concrete causing discoloration, and in some cases chemical reactions that may physically degrade the concrete surface. Spills and leaks of hydrocarbons (petroleum products like motor oil), cleaners, paint, and solvents also cause unsightly concrete stains. Home remedies like scrubbing with bleach or white vinegar are commonly recommended, but commercial cleaners do the job faster, more thoroughly, and can help prevent regrowth. This can be a recurring problem in humid areas, so it’s helpful to have a fast-acting, long-lasting solution. They often appear as green streaks, film, or cushiony growth over a broad area on concrete surfaces that stay damp. Stain Typeīiological stains are caused by living organisms such as mold, moss, and algae. Just ahead, find out how stains are classified, which cleaners work on the different kinds of stains, and other useful tips that can help you choose the best concrete cleaner for your project. With many concrete cleaners to choose from, you may wish to understand how they work to remove different types of stains. Photo: What to Consider When Choosing the Best Concrete Cleaner
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