i find wfpoling easy after over 2 and a half years since switching.
once the windows and frames have been cleaned with wfp a few times i can clean some windows in less than 10 seconds!!
decent brush,water at 000,light carbon fibre pole,high flow ITS EASY!!!!
I can honestly say ive NEVER had any problems with vents.obviously i make sure i dont squirt water directly up inside them but i just clean as normal above them.
the thing is ronnie your staff dont value their standard of work like you do as its not their business!!