Best ultrasonic lp cleaner in 2020 and what surfactant best?

Degassing is nothing more than running the ultrasonic cleaner with no records in it each time you fill the tank with water, prior to starting your record cleaning. It removes oxygen from the water and allows proper ultrasonic cleaning. If you have a unit with the degas feature installed you simply fill the tank and hit the degas button/feature. If not, fill the tank,  turn it on and run it with no records for about 12-15 minutes.

Here is a vote for Perfect Vinyl Forever.
It is an excellent service and will clean your records better than any one machine you put in your home will. You never have to clean them again afterwards, if you take care of them. At worst dust them with a carbon brush. So, expensive, but one time not recurring. 

My Audiodesk Gläss cleaner is working perfectly
easy. One start bottom and that is it.

After 5 minutes you have your cleaned and dried
vinyl in your hand.

After many tests with different solvents I currently
use triple dest water with the tiny amount of the
original cleaner and some drops of Mirasol.

I bought a degritter a couple of weeks ago. Prior to that, I was using an old nitty gritty I bought used on agon. I was happy with it but kept reading about the ultrasonic machines being so much better. However I couldn’t get past all the problems people had with them plus the cost just seemed crazy and hard to justify. Finally COVID craziness got to me and I broke down to buy one. Apparently they are in very high demand and many dealers sell out quickly. I will have to say with my brief experience I am very happy with the purchase. Most of my records are very clean so wasn’t sure if it would make that much a difference. But now I would highly recommend the machine  before upgrading any of your equipment. It really makes a difference even on records you think are in perfect condition.

Bought a Degritter this year after using a VPI 16.5 for almost 10 years.  I used 3 steps (enzyme, cleaner, ultra distilled water rinse each step with its own brush and vacuum wand) with the VPI and had very good results,  but the time for each album was almost 30 minutes... the Degritter, using their surfactant additive, requires at the most 10 minutes (usually about 5 minutes) and I am not participating in 95% of that time.  The results are better than my previous three step process.  Highly recommended.