When Sparkies or plumbers go back into an already cleaned area?. That is why, when you have cleaned an area you should go to the site foreman/client representative and have the area signed off as cleaned to their satisfaction. If there is a recall to trades for some other reason, and a re-clean is required, then, if you have phrased the T & C's correctly you should be able to charge, somebody for the re-clean. If not it burns a big hole in the profit.
It's straight commercial practice. Once it's been cleaned, to clean it again costs somebody, and hopefully it is not the cleaning contractor.
It's not a theory. That is the trouble with the cleaning industry, we, according most trade sit at the bottom of the food chain. We should and must sit at the top of the food chain. Without us, that is the industry as a whole, nothing and nobody would work. It's about time we stood up and made the point. Cleaning, whether it be builder's cleaning, retail, offices or industrial, without cleaning companies, and their staff and more importantly their expertise, nothing would operate. I know i sound like a nutter, but it is about time that we stood up and shouted the point. We are the most important ipart of the service sector.