I have a 2009 Kia Soul and the windscreen washers are very weak. The pump is working and the rear washer is fine, will adding a limescale to the water bottle help to free up the water flow? The ...

You can check the first thing yourself. You can probably clear any gloppy debris from the pump filter by shoving a hosepipe into the bottom of the washer reservoir and blasting the crap out. If that ...