depends on the job at hand, id say the 18 inch gets the most use, but the 6 inch and 22 inch have their places.
I just voted on NWCD on all polls.
we do alot of 6 over 6 in mass. so the 6" works the best
Residential- 14" or 6" for true divided lites
I have a lot of outdoor shopping malls that I do… I love using a 30" scrubber. Wet glass quicker, and use it farther.