I have a 2002 slk32 AMG that I purchased in August 2001. We do not use it much. To my knowledge we have never used the headlight washer. Today I refilled the washer tank and tried to use the headlight washers. The doors open and the little wand jumps out but there is no spray. As it has never been used I suspect the nozzles need cleaning. Could anyone tell me how to go about doing this? Thanks in advance for any advice.