If the smell appears to be specifically associated with using screenwash, then the reservoir is polluted with bacteria that are feeding on the detergent. You need to sterilise the water bottle. Best way is to remove it from the wing so you can give it a thourough clean out. I suggest using a chlorine type cleaner such as Domesdos. Put an eggcupful into bottle and top up with hot water. Leave as long as possible (overnight preferably) then flush and refill with new screenwash. The blue stuff you can get in 5l bottles is good. Contains alcohol which keeps the bugs down.
TC
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