Every RCM that I've used made the record's sound worse. Those ultrasonic machines are Chinese garbage. They don't even work as they're suppose to. And the real industrial machines are incredibly expensive.
Cleaning by hand is the only way. Cotton ball heavily soaked in 91% alcohol. Clean in the direction of the grooves and apply decent pressure. Keep doing it until the cotton ball remains clean. Usually 2-3 per side.
Cleaning by hand is the only way. Cotton ball heavily soaked in 91% alcohol. Clean in the direction of the grooves and apply decent pressure. Keep doing it until the cotton ball remains clean. Usually 2-3 per side.