Last year around this time, I stated that next year we would be discussing the same issues regarding the merits of PWNA. Nothing has changed. We still discuss the pros and cons-the only thing that changes are the faces.
If it works for you great-then its worth it. If you attend a show and pick up a few idea that's even better.
Hood cleaners are unique in that they have issues of public safety, local codes and so on-Certification is starting to be a issue. If you are a hood cleaner you had best get one so that you will be able to react & self promote your knowledge to your customer.
David;)