How can I fix my windscreen wipers and washer?

My windscreen wipers won't work on the intermittent setting at all and when I click down for a single cycle it just stops in random places and I have to keep my finger on the stalk to bring it back to its original resting place. I have also found that the windscreen washer won't work at all either. I have tried changing the fuse but still no joy. Any suggestions?