Ultrasonic blind cleaning has been around for decades. Here is a quick overview of the basics for those who would like to learn more about this cleaning method.
Ultrasonic blind cleaning uses the energy of exploding air pockets in a water and mild soap cleaning solution in long narrow tanks to gently yet thoroughly remove dirt from EVERY surface of the immersed item. Ultrasonic machines are made in different frequencies and blind cleaners themselves also come with varying degrees of knowledge about the cleaning process and the items they are cleaning. The results with ultrasonic cleaning depend upon a bunch of variables that improve when the right mix of knowledge, equipment, chemistry and conditions come together. Read the more technical explanation below if you want to see that while it isn't exactly "rocket science", to do a good job and safely clean blinds (which can be appropriately cleaned using this method) an ultrasonic blind cleaner needs to know more than how to dunk a shade and collect money.
Without getting too technical, ultrasonic cleaning is based upon the effects produced by ultrasonic sound waves travelling through water. The compressions and rarefractions between each sound wave create gas pockets that expand and then explode throughout the solution. The agitation caused by these exploding bubbles provides the energy to gently yet effectively knock dirt and other debris off all surfaces immersed in the ultrasonic bath. The sound waves are produced by vibrations coming from transducers tuned to certain frequencies which are usually mounted in long flat box shaped pods inside the tank or underneath its lower surface. These in turn are powered by a generator which provides the energy to power the transducer and may allow the operation to vary the intensity or speed of the cycles by which the transducers are powered.
The effectiveness of ultrasonic cleaning depends a variety of factors. We’ll briefly touch upon several key points, hopefully, dispelling several common misconceptions along the way.
Several variables affect the actual power of any ultrasonic cleaner. Mechanically, the type of machine used and the actual power of the generator (relative to the amount of water and type of the materials to be cleaned) determines the available energy that is going to be available for cleaning. For blind cleaning a frequency of 40 MHz is popular as it provides a reasonable combination in both size and number of ultrasonic events produced in the cleaning solution (cavitation events, etc.) Some machines use a more aggressive 25MHz while others may have transducers for two different frequencies ( 40MHz and 65Mhz or higher) to provide a mix of aggressive power and fine particle removal. Many machines also allow the operator to change the intensity of the power so that ultrasonics can be very gentle for delicate items and more agressive when appropriate.
Regardless of the mechanical potential available, the effectiveness of the ultrasonic cleaning is affected by the amount of water in the tank, its quality and the type of soap that is used. While ultrasonic cleaners will nominally work with various cleaners, the best results are achieved by using a soap designed specifically for ultrasonic cleaning. Just like an engine runs best on the recommended blend of fuel, blinds designed to produce the right environment for good ultrasonic action and effective cleaning under ultrasonic conditions make a difference.
Finally, time is an important component in the blind cleaning equation. If one were to dip a nicotine stained vinyl vertical in the ultrasonic tank, within moments wisps of smudgy yellow grime would be observed floating off into the water. Effective ultrasonic blind cleaning requires attention to the items being cleaned and the degree and type of soiling involved. While most of the dirt is removed in the first minute or less of immersion in the cleaning tank of the ultrasonic machine, fabrics absorb more energy than hard objects and respond at different speeds. As the cavitation process is mildly abrasive over time is it possible to damage paints or specialty finishes if items are exposed to strong ultrasonics for a long period of time. A typical mini blind can be cleaned multiple times without any observable or significant damage. Often ultrasonic cleaning gets blamed for damaging blinds when the technician’s poor technique or neglecting to remove the shade promptly was actually at fault. Similarly one could damage blinds with hand cleaning methods using an aggressive brush, harsh cleaners or by applying too much energy to the process. Another common misconception is that ultrasonic cleaning may cause fabric blinds to fall apart
As ultrasonic cleaning involves water immersion, it is important to limit its application to materials that can safely be immersed in water. The ultrasonics aren't the problem if fabrics shrink, glues fail or dyes run - it was their incompatibility with the water that probably caused the problem. While most hard blinds and many fabric blinds can be effectively and efficiently cleaned using this method, with fabric shades come some pre-qualifications. The age of the shade (sun weakened fabrics, glues crystalized with age, etc.) and the type of soiling present may limit what (if anything) can be done in terms of ultrasonic cleaning. Room darkening honeycomb shades with foil liners (or water sensitive glues) may be damaged by ultrasonic cleaning (the cavitation erosion will literally dissolve holes in a piece of aluminum foil in less than 20 seconds).
All this being said, ultrasonic blind cleaning when harnessed properly under the care of an attentive cleaning technician can be used to do amazing things. As the ultrasonics penetrate to efficiently yet effectively clean EVERY surface of the immersed item the deep cleaning results achieved are unparralled when supported by the right cleaning procedures. Typically a blind or shade is immersed in the ultrasonics, rinsed and then partially or fully dried before it is hung back in the window. The ultrasonic cleaner may bring their machine with them to the job site in a truck or trailer or transport the items back to a shop for cleaning.
In closing, it is also worth repeating that problems with fabrics puckering, glue lines failing or the delamination of room darkening shades are related to deficiencies in the product or cleaning procedures, not the ultrasonic specifically. Using the services of a knowledgable, professionally minded blind cleaner is important. They should for instance know the difference between the Silhouettes or how to handle Luminettes or even how to efficiently clean well over a hundred mini blinds per day, if necessary. They will also know which cleaning chemistry is best for treating different types of blinds, fabrics or soil conditions.
This was just a quick outline of the basic principles behind ultrasonic blind cleaning. One really needs to understand how the process works and how it can be harnessed to quickly and effectively clean blinds or shades without damage to run a profitable blind cleaning operation. Those interested in more in-depth training are encouraged to invest in some professional training. The Blindcleaners.biz Network provides a Blind Cleaner’s Training class several times a year. Several days are spend discussing and working with common and even some specialty blind cleaning scenarios. If you are a blind cleaner with questions about certain types of blinds or a person wondering if the ultrasonic blind cleaning business is the niche for you - invested in learning to do things right. It will pay off quickly as ruining one or two expensive blinds or or buying an expensive machine before you know enough about it to determine if it is actually a good fit for your business will cost you much more.