Choosing between ultrasonic and spray wash cleaning methods isn’t just a technical decision—it’s a critical one. Choosing the right method ensures optimal performance and quality, while the wrong choice can lead to costly delays, damaged parts, and compromised quality.
When matching parts that need cleaning to a cleaning method, you need to identify three core aspects about the part — geometry/shape, soil type, and material type.
The geometry of your part significantly impacts which cleaning method is best. Parts with intricate designs, internal channels, or blind holes require a cleaning method capable of reaching every nook and cranny.
Parts with intricate internal channels or complex geometries are best suited for ultrasonic cleaning methods, or vacuum cycling nucleation can be employed to effectively eliminate trapped air pockets, ensuring thorough cleaning of hard-to-reach internal areas.
After identifying the geometry of the part, understanding what kind of contaminant you’re dealing with is essential for selecting the right cleaning approach.
Ultrasonic cleaning excels in handling contaminants such as oils, lubricants, coolants, and other low-viscosity residues due to its advanced cavitation process.
This technique gently blasts parts with microscopic bubbles creating a precise, thorough agitation capable of effectively removing contaminants without damaging delicate parts or surfaces.
Spray wash cleaning is particularly effective for tackling stubborn, high-viscosity contaminants such as heavy greases, baked-on carbon deposits, or dense buffing compounds.
This method leverages targeted, high-pressure spray nozzles to deliver impingent force, rapidly penetrating and/or dislodging tough residues far more efficiently than ultrasonic techniques.
Of course, a combination of spray wash cleaning and ultrasonic cleaning may be the best approach. If a part with a complex geometry is covered in heavy grease, a spray wash could be best to clean off the majority of the soils, followed by an ultrasonic clean for blind holes and tough-to-reach areas.
After determining which cleaning method will be most effective, the next most crucial element when selecting a detergent is the material compatibility. Choosing the wrong detergent can compromise your part’s integrity, leading to costly damage or premature wear.
For sensitive materials, like aluminum or magnesium alloys, you should use detergents with neutral or mildly alkaline pH levels to prevent corrosion or etching.
More robust materials, like stainless steel or carbon steel, can typically handle stronger, higher-alkaline detergents, which effectively break down challenging soils without harming the substrate.
For users directly handling cleaning equipment, operational safety and simplicity matter.
Choosing ultrasonic or spray wash cleaning isn’t just about selecting equipment. It’s about aligning the cleaning method with your specific operational needs, from part geometry and soil type to material compatibility and user safety.
Need more information to choose the right detergent? Use our free comparison guides for ultrasonic cleaners and spray wash solutions to find the perfect match for your cleaning needs.
Brulin’s specialty detergents enhance each cleaning method, safeguarding both parts and personnel while delivering consistently excellent results.
Contributors: Brandon Mikesell (Quality & Tech Support Chemist, Brulin)
Originally Published: May 22, 2025