;DSorry mate, most people know what brush I use, an Ionics double trim.
The words of Mr Fogwill below,
"Let me start by clarifying one thing, the most popularly used is not necessary the best. A while ago there was a certain brush manufacturer that caught on to the fact that the reach and wash system and water fed poles in general were gaining popularity among window cleaners, and quite rightly got in on the act. They realised their was big business and started promoting their car washing brushes at trade shows etc, and offering good deals to water fed pole suppliers. They even made some changes to the brush to make them more water fed pole friendly, trouble is they forgot about two main factors that overwhelmingly effected the cleaning power of the brush. Firstly the density of the bristles, their brush is far too dense and this restricts the flow of dirty water passing through the bristles, and working its way down and off the glass. Secondly the bristles were splayed at the ends to make them softer for car paintwork, as glass is a hard surface this was not necessary for a window cleaning brush, it had a negative effect and trapped dirt particles, again restricting the easy passage of dirty water through the brush and down to the bottom of the glass. These two factors although not the only disadvantages makes the most widely used water fed pole brush a nightmare to use.
How did the average window cleaner not notice this? They were supplied with the brush from their supplier, they didn't know any better, after all if you pay good money for a window cleaning system you would expect to be supplied with the best equipment to do the job it was designed to do. Trouble is most of the water fed pole suppliers have never cleaned a window in their life, they picked up on a brush that was being heavily promoted, got a good deal and the rest is history. The window cleaner got round the defects on the brush by brushing the window and then lifting the brush off the glass to give it a final rinse, which is both time consuming and a much higher water consumption over the course of the day."
Pro