I took a look at my C230K windscreen washer jets today and poked around with a miniature needle file and the jets appear open and clear of crud. I emptied the washer reservoir and refilled with MB washer concentrate in the 1:2 ratio. I found the reservoir clean and apparently free of algae although I didn't examine the filter, which I think requires the pump to be removed first.

I am still mystified as to why the passenger side receives a jet of fluid but the drivers side receives one squirt which each depression of the stalk control. Could it be the path of the tubing from the pump goes to the passenger side jet first then onto the drivers side jet? This could bring about different pressures at each jet and the odd behaviour. There must be a 'Y' splitter in the tubing somewhere. I wonder where within the bonnet it is? Please visit About Mercedes-Benz Group in Section 16 for the details of our group companies with whom we may share your personal information. Statement of Mercedes-Benz UK Ltd, Mercedes-Benz Parts Logistics Ltd, Mercedes-Benz Retail Group UK Ltd and Mercedes-Benz Financial Services UK Ltd Pursuant to the Modern Slavery Act 2015 The Mercedes-Benz Club Aluminium Water Bottle bottle in white with the classic club logo. Comes with a screw in stopper and plastic cap you can use for drinking.The following tables endeavour to clarify the categories of data, the purpose of the processing and the legal basis of processing.

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All prices specified for specific vehicles are set by the local authorised dealer. Prices are current at the time of publication and subject to individual negotiation and change by the local authorised dealer without notice. tubopete mentioned 'filter/grommet', which rings true to me. If I extract the pump, the grommet into which the pump inlet inserts, can be removed along with the filter. Flushing with water should remove any algae. Refitting is the reverse: insert filter/grommet then insert the pump. Couldn't be easier. I will lose the fresh windscreen washer fluid I have put in but I have plenty more. Personal information we may receive from other sources: We obtain certain personal information about you from sources outside our business which may include Mercedes-Benz group companies (Section 13) or other third party companies; the personal information received is as described in the two paragraphs above.