hi there
if your doing a pre paint clean, then you'll probably end up doing either 4 or 5 cleans to each property.
there arent many developers doing pre paint anymoe, due to time scales of build, etc.
re price, you may like to search the archives on here, as there is a mountain of info on this subject.
you may also like to consider a site vist whilst scaffold is up to do high level.
regards
martin