good morning. I'm a newbie and am just about to get started.got 2 customers who complained about the previous window cleaner leaving white spots on windows. I m wfp window cleaner .could you well experienced guys tell me what 's the best way to wipe dry white spots on first floor windows without climbing up ladders ( of course I ll use a step ladder) . would a dry cloth on a wfp brush do the job? many thanks. cheers