I have a combo shampoo/vac unit that Im having a little problem Im sure somebody on here has encountered. Inside the filter compartment there are ss screens protecting the motors from debris,however, I am having a problem keeping these screens lint free every few days they build up a lint cover which in turn kill suction. Any suggestions why or what causes this issue. I just bought this wash and have never had this type filter in a vac so Im kinda lost a bit. Any comments are appreciated.