Let me explain in more detail.From a round of 300 customers per van per month we find that during the height of summer we get about 2 complaints per month. Sometimes these complaints are not always valid either. Probably closer to 1 valid complaint per month.This is less than 1% of customers done that complain. 99% of customers do not complain.For me personally this is what i class as an acceptable level of complaints. To send staff out day in day out bringing back a good turnover i can live with this amount of complaints.For those of you on here who are employing and getting 0 complaints congratulations. That is seriously admirable. In my experience and from those i have spoken to who also employ most employers expect to get some level of complaints.Most of the time its more to do with the customer than it is to do with the window cleaner or the job done in question.Some customers standards are just too high and unrealistic.I prefer to tailor our service to the 90%+ of customers who are happy with a good job, then tailor to the 1-10% of customers who expect a perfect 100% highest standard possible job.You wont find a single negative review on our website or social media.When a customer does complain we offer a Free inspection & reclean, or if we are finished in their area for the month, we offer them a free clean next time. Nearly all of our customers are happy with this and most issues are resolved, unless the customer has a standard or expectation that we realistically cant meet or they have problematic windows/seals not well suited to wfp. In which case they get dropped anyway.