Plain water in this weather is a very bad idea, it could take ages to de-ice itself now, I've even heard people saying that washer fluid that covers down to -15 is still freezing in the pipes so you need some strong stuff at this time of year!welll i have a new revelation, as i always use just plain water as i go through it so much its all very frozen, as when i try to use either the front or rear the revs drop so there must be power getting to the motors but no go as the motors dont even make a noise....