The hose that empties the tub also spits out wet lint. It clogs drains. That too I know first hand. The nice man who charged me gazillions of dollars per hour portal to portal to rat out my basement drain explained that.Washers have lint traps?
They sell lint traps at the hardware store, but I use old nylon stockings tied over the end of the hose.(When I get a run in one leg of pantyhose, they go in the lint trap bag to use the intact side) You can probably buy really cheap pan hose at Walgreens or Target for a much as the hardware department charges for a trap.