Dirt and other common stain-causing grime on concrete surfaces generally come off with soap water and a good scrubbing, but some are too stubborn to get rid of such as oil, grease, rust, paint, and organic-based stains (e.g. blood and urine stains) . These particular stains need a special type of concrete cleaner to get flushed from the surface. Getting rid of stubborn oil and grease on concrete walls and pavements is usually done with the aid of alkaline-based concrete cleaner coupled with the use of industrial cleaning supplies and equipment like pressure washer and rotating floor scrubbing machines. Hot water is often used as it lifts the oil residue from the concrete, combined with alkaline-based cleaner that emulsifies the oil and making the stain easier to pressure wash.
Concrete walls and surfaces that are blotched with rust stains are tough to clean without the help of concrete scanning Sydney containing oxalic acid. Letting the concrete cleaner set for 15 or so minutes before rinsing off with a power washer should be able to get the rust stains out.
Unwanted graffiti and paint job can either be covered with a fresh coat of paint or by using commercial paint strippers that are readily available. Removing paint from concrete surfaces can be a tedious job, depending on which type of paint to be stripped off. There are available in paint strippers in the market today, and they come in different chemical ingredients, varying on their strength. The least aggressive and the safest to use are those containing a citrus-based solvent. Other paint strippers contain either potassium hydroxide or methylene chloride—chemicals that can be hazardous without making use of proper safety precautions.
Stains brought about by bodily fluids are very tricky to clean out, and washing it with soap and water alone does not do much to completely remove the stain from concrete floors and walls. Using hot water to wash and rinse these kinds of stain off is definitely not recommended because the heat will cook up the proteins present in bodily fluids, therefore making the residue stick more firmly on the concrete and ultimately making it harder to clean. Bodily fluids such as blood and urine contain proteins that cannot be broken down by merely using detergent and water. Concrete non-destructive testing containing active enzymes and bacteria help by breaking down and digesting stain-causing protein residue that are affixed on the surface of the porous concrete. This type of concrete cleaner is also known as the oxidation cleanest because the process of oxidation is utilized.
Minor cleanups can be done by oneself, although safety precautions should be carried out such as wearing protective gear to avoid accidents and injuries. Hiring professional cleaners should also be considered especially when it comes to major concrete cleaning. Specialty concrete cleaners are available in most cleaning and janitorial supply outlets and in some hardware stores.