my screen washer stopped working, pump was running i think the filter was blocked,all i done was feed a plastic pipe in to the bottle then blow into the pipe which stirred the muck up at the bottom of the bottle then syphon the water out, do this 2-3 times and it will clear filter, this worked for me and saved me taking the bottle out,you will need about 2-3 ft of flexible plastic pipe, good luck if you try this
Bob F, January 2015