
Cleaning encompasses many different methods. A cleaning method’s effectiveness depends on other factors besides the approach. If you’re washing soil off your hands, a simple scrub with soap and water may suffice (water-based). However, if grease is involved, you may want to use a chemical-based formula (solvent-based).
Water-based (also known as aqueous cleaning) cleaning uses water with other additives, like detergents or soap, to remove dirt or grime. Solvent-based cleaners, on the other hand, are chemical cleaners.
The effectiveness of the two methods comes down to how they interact with the contaminants. Water-based cleaners eliminate water-soluble contaminants like soil from surfaces by isolating dirt and grime particles, freeing them so they can be washed off. Solvent-based cleaners dissolve contaminants, drawing them into the solvent and away from the surface.
Because solvent-based cleaners mix with most contaminants, they are the more common method for industrial applications. They’re also more cost-effective, reliable, comprehensive, and efficient than water-based methods in most cases. Moreover, using solvent-based cleaners typically requires less effort than water-based cleaners.
For instance, water-based cleaning requires prepping (like setting water temperature to a specific level) before the actual wash, as well as rinsing and drying. These processes take time. Because solvent-based cleaners do usually do not require rinsing or drying, which could require additional space or equipment for drying, they tend to be more efficient. Fast-evaporating solvents, for instance, disappear shortly after they’re applied, reducing process times, which can be key in an industrial setting.
The superior effectiveness of solvent-based over water-based cleaners stems from the differences in their surface tension. Surface tension is a liquid’s ability to form cohesive droplets. The lower the surface tension (as found in most solvents), the harder it is for the liquid to form droplets, meaning it spreads out evenly over the surface. On the other hand, high-surface tension liquids (such as water) easily contract into droplets, limiting their penetrative power. Solvents do not form droplets, meaning they penetrate tight spaces better and dissolve contaminants without being trapped.
Also, while water-based cleaning is effective at room temperature up to about 176F, solvent cleaners are not as limited. Some solvents are just as effective well below room temperature and above 176F.
While solvents are more versatile than water, they don’t come without risks or hidden costs. For instance, aqueous cleaning is more environmentally friendly than solvent-based cleaning. This is because of the toxic chemicals present in the solvents, which must ultimately end up somewhere in the environment.
Also, the presence of toxic chemicals in solvents means that workers will likely require advanced PPE (personal protective equipment) compared to when handling water-based cleaners. Also, some solvents are highly flammable, making them dangerous when used near possible ignition sources. Therefore, solvent cleaning typically requires stricter safety protocols.
The two methods’ suitability comes down to the type of contaminants being dealt with, the materials being cleaned, and the process requirements and constraints. Experts recommended considering all these factors for optimal results.
Ultimately, the user must choose the method that is most cost-effective and efficient. For instance, a method that requires investing in expensive pressure washing equipment may not be worth it, even if it promises the best results. Using solvent-based cleaners seems to be the best approach. Even so, the unique situation and goals will determine whether a solvent-based or a water-based method will be optimal.
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