dont use ladders on commercial buildings mines all done with wfp
I clean sash windows with wfp...top sashes first then back to first one and do all the bottom sashes...the single glazing comes up great...always sheets.No problems so far...unless windows have been left open in which case I`m up the ladder to close them and then WFP...the less time on the ladder, the better.
no you dont have to keep adjusting for different windows. i have mine three runs down and for different window heights you just adjust ladder up or down leave the standoff on same run