I've always used mono's but I find them not adequate enough for first cleans. Yesterday I did a very dirty first clean, and most stuff came off, but there was dirt that didn't come off, but with a quick scrub of a microfibre, it was gone. That was with going over the pane two times, rinse, then another time, then rinse again, put a bit pressure on the brush too.
It seems to have gotten worse with my newer superlite brush, my old one I didn't have such problems with. I roughly bought them around the same time, so I'm not even sure if it is indeed a different revision brush. I think it's a mark 2. Also, it seems very hit and miss on first cleans ie. spotting, whereas before I barely had any problems on first cleans.
I'm thinking of swapping over to a flocked brush for first cleans, and then do maintenance cleans with a mono. That, or swap back to my old brush, see what difference that makes.