As Mr. Kong said, wfp is very easy to get wrong. To be honest I'm not supprised so many get it wrong as it seems to be sold/talked about etc as a magic solution to wealth!!
It takes time, practice, effort, etc & lots of it to perfect. You have to be armed with a proper knowlage of what is going on, only then will you be able to get the results. Then you begin to gain experience of where to use it & where not, as it's not suitable for all work. Another downside for a newbie is being sold crap equipment- heavy, bendy poles with poor brushes which are jetted wrongly, or, indeed him choosing the cheapest options.
It's very easy for the results not to be good on the first clean, or maybe first few cleans for a newbie. When the system is explained properly to a customer, most are willing to forgive this BUT in your case you maybe starting handicapped by another wfp'ers bad work/attitude maybe?
Wfp is a very good tool, not perfect by any means but IMO you are looking at, at least 12 months to be fully profficient in it's use! & even then you will still be learning.

Tony