There's a YouTube channel called SonicFlare. He interviewed the person who runs that service. A very intense cleaning with sophisticated equipment. I have not used the service since I have an ultrasonic cleaner and it serves me well.
Perfect Vinyl Forever
I have quite a few LPs that I would like to clean better than with my manual technique. It is not cost effective for me to buy an Ultrasonic device. Any experience that can be shared with the mail in service, "PERFECT VINYL FOREVER"?