I spent a lot of time during the pandemic reading everything I could about ultrasonic cleaning. Neil’s book is the pinnacle of knowledge on the subject as applied to vinyl records. I have a graduate degree in geochemistry so I could muddle (barely) through the science, but some people just want clean records without knowing the “nitty gritty” details. So here’s a “real-world” accounting of my record cleaning journey.
I was using a quasi-DIY vacuum RCM made by a local technologist who custom 3-d prints plastic parts for clients. Utilizing a clean (using the “typical” isopropyl alcohol, distilled water and photo flow recipe)/rinse/vacuum work flow, I had good results but it was noisy, messy and laborious. The method was best-suited for batch cleaning, rather than for a single record prior to play.
I then moved to a quasi-DIY ultrasonic for cleaning, but still used the vacuum RCM for rinsing and drying. This should have been the best method but results fell short of where I thought they should have been - not different from the vacuum RCM-only method. It was also a lot of work. My total outlay thus far for both systems was less than CAD$500.
I had a look at the Audio Desk and KL Audio ultrasonics but for the price, it didn’t seem the convenience was worth the extra cost because results (from what I read) weren’t much different from my home brew methods. The Degritter came out with great fanfare, but was almost as expensive as the incumbents. I also didn’t get the sense that it provided a quantum leap in cleaning effectiveness. Reviews focused on its ergonomics and looks instead.
When the Humminguru came out I was skeptical. It was considerably cheaper, quiet, looked good, had a small footprint, and was fully automated. But it was made by a toy company (!), had tiny transducers, and recommended using only water for cleaning. It sure screamed “lifestyle” product and didn’t seem suited for serious vinyl collectors.
Despite my misgivings, I decided it was cheap enough to take a flyer on, so I put it on my Christmas list. It has now been in regular use for two years, and has probably cleaned 500 records. The rollers have been replaced once (numerous spares came with the unit). It is so convenient that if I pull a record to play and realize I haven’t ultrasonically cleaned it, I can pop it in the Humminguru and it finishes its cycle in about 15 minutes. The only thing I do differently from the manufacturer recommendations is add six drops of Ilfotol wetting agent to the tank every time I change the water, which is about every six records. Honestly, it is a joy to use and gives me the same (not better!) results as my prior methods. And given that I’m just using RO water and a few drops of wetting agent, I don’t worry about the residue after drying. But for my humidity and temperature levels, I need the wetting agent for the drying cycle to work effectively.
One last thing I do is brush the record once it’s on the platter to remove any remaining debris that may have been lifted from the grooves but remained on the record surface after drying. There is sometimes a “scum line” that forms near the record label, where debris that was floating in the tank settled on the record when the tank drained. A quick brush before play (I use a Swiffer to great effect) does the trick.
Note that really dirty records need some elbow grease, so a pre-scrub in a sink with running water is recommended. But I almost never buy records like this. Also note that records are quieter after cleaning, but a scratch is a scratch is a scratch - cleaning the record won’t fix that. Finally, I try to buy the best quality records I can, so I’m not giving the Humminguru THAT much of a workout. But I can honestly say that for ME, this little unit is right at the intersection of cost, convenience, and performance. The Degritter costs CAD $5,100 with tax in Canada, a price I won’t pay, especially since I’m not convinced the cleaning performance is much better than the HG, which cost CAD$700 to my front door from Hong Kong.
Hope this helps. Happy to answer any questions of a practical nature you may have.