I have to agree with the theory that people who will pay more for items to be cleaned, are the ones who have them cleaned before they get dirty
I have a large number of American clients around Hampstead who call me in annually BUT only spend 6 - 7 months in the property. I go back sometimes and find foils and rake marks from previous visit :
On the other hand, you get people who want job done as cheap as possible and have not had items cleaned for " ABOUT 5 OR 10 YEARS"
I know what sort of work/client i aim for