The gunk settles at the bottom of the reservoir and blocks the filter on the pump pick up.
Either remove the bumper or use the "keyhole" method easing the wheel arch liner out of the way. Pull the pump off the reservoir and pull the filter (doubles as a grommet for the pump inlet) out. Clean the filter with hot soapy water, rinse thoroughly. Make up a mild solution of bleach and hand hot water, place a basin under the pump outlet, pour the bleach solution in the reservoir filler. Repeat that a couple of times then rinse the reservoir thoroughly with a hose in the filler. Replace the filter/grommet, replace the pump and refill the reservoir.
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