mjp100drums

Hi, have a really bad intermitant egg smell in the car from the air vents whether the air con is on or off. Usually happens first thing or when you stop, doesn't happen when on recycle. tried the usual aerosols, didn't work.Called in at my local m.b garage ,was advised to clean out my washer bottle as it had that same smell and was close to the air intake filter. Anybody had the same thing?