Jamie ,
Correct in your assuption hwe is the best method , but not always the best option !!
and as you have already stated you do use a cimex for cleans, and yes of course all the manufactures of all the differnt methods will tell you exactly what you want to hear.
I personaly use straight forward h/w/e and cimex for low profile cleans providing not too soiled , and for maintanace cleans, a few members on here do have the varying types of extraction attachments , perhaps they will enlighten you more, but the answers will all be the same , depending what they have theirs will be the bee,s knees
geoff