Hi I clean windows on a new build siteam with wfp and I know at least two other cleaners have customers on site but they only do glass not frames and doors. I'm thinking of posting flyers advertising that I do all frames glass doors etc and put my price on too. I'm quite confident I will gain a good amount of customers from it because I'm not the dearest cleaner out there. But if I do the other cleaners stand to lose out. What would you do?