Vinyl cleaning - Ultrasonic vs. Walker products

Ultrasonic. No contest.

I second on the Ultrasonic. I had a VPI 16.5 And use day the Walker 4 Step system for a few years and then bought the Audio Desk System. The Walker did do a good job, but what a time consuming process and I think the UD does a better job. 

I have a VPI 16.5 and an Audio Desk US cleaner.

If the records are really dirty, you may need both. The vacuum followed by the US cleaner.

The vacuum cleaner is like washing your car. The US is like getting it detailed. In the case of really dirty records, you need to get the crud off before you can use the US effectively.

Mobile Fidelity sells manual cleaning solutions and scrubbers, stick with manual to clean then the MoFi cleaninging solution followed by an Audioquest record brush