Originally Posted by aaronng Take off your bumper, then there is a drain valve at the bottom of the resevoir tank. Next time, just add a little sonax or rainX windscreen spray additive before adding water as that helps prevent mould growth. Or use your spray more often. hi aaronng, how much RainX do you usually put in there? how much water does the washer tank can hold? do you put in the water to the brink?
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