Can anyone advise on a recurring problem that I keep having with my Bosch Washer/Dryer. The dryer stops drying, which is due to the system getting blocked with fluff. When the initially happened, the engineer recommended that every week or so I put the machine on an empty boil wash cycle, to flush the system though. I have done this, but it has again got blocked with fluff. Previous machines I have had, which were Zanussi had a filter that you could manually clear, but this one hasn't. Is there a product I could buy that would periodically flush this system through. At the moment it is under extended warranty, but I am concerned about what will happen when this runs out.