I did a bit of record cleaning with my HumminGuru cleaner, and you can see the results pretty clearly. This is a record in an old radio concert of Journey from the early 1980s (radio concerts were syndicated to stations that way back then). It sat in a cheap-o plastic sleeve for a few decades and I guess the sleeve’s chemicals were starting to imprint on the record itself, leaving that weird smudging all over the vinyl. I ran it through the HG machine, and the results were mixed—because the smudging is so evenly distributed, you could see exactly where the HG did a great job cleaning it, and where it didn’t do much. Extremely long story short (I deleted most of this because IG said my caption is too long), I wound up spraying the record down with Groovewasher record cleaning liquid and following that brand’s cleaning method (spray your record, then wipe it with their brush, but let’s face it, that just pushes dirt around your record). Then I ran the record through the HG machine. Its ultrasonics cleaned off the Groovewasher liquid and dirt beautifully. I’m not happy about essentially using the HG as a very expensive sink, but on the other hand, it worked really well. Among HG owners online, there’s a school of thought of adding a drop or two of Groovewasher liquid to the HG machine’s water when you clean, but I didn’t see any difference. On the other hand, spraying down that record used a lot more than two drops, but it also got far better results, and you could see the difference even as the record was going through the machine—the water was getting into the grooves and not just sheeting across the record. More experimentation to follow.