i use to have one that wanted me to come every 2 weeks, done first clean then on second and third clean would come running out of house saying not this time, so just droped him an still do his sons, who asked me y i dont do his dads any more so i told him, he said dont blame you
i get custys now that say not this month, i drop them u can fill your month up with maybes, who only want it clean when really dirty
if a custy asks to 2 monthly, i move them to the day in the month where i have my 2 monthly slots
remember you are not a charity, the problem i think is that wc is not seen as a professional job, just some doley doing it till they get a proper job, so they think they can treat you how they like, you dont see these people saying to sky, dont want it this month maybe next month,
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