ok mate, i thought you may have had problems with it, as i understand it the extraction part of the process is done in the post vac isn,t it?..
My response was not meant to have a dig at you , just the fact that people think this process of getting money from people ( I won't call it cleaning) is acceptable,
do they explain to domestic customers that they will not be removing any dirt... that is their job, they have to try and remove it with their home vacuum cleaner.
Don't get me wrong I'm a total believer is using this type of cleaning in commercial properties but lets get real do we really believe a domestic customer will have any chance of removing the dirt with subsequent vacuuming.