[peanut]

A Bissell lift off (the spot cleaner) hose wasn't spraying cleaner/water. The obvious would be the hose, trigger or the water pump motor... But no, the water/cleaner holder developed a slight dent underneath which means the valve does not connect with the base. So heated it up with a hairdryer which popped the dent out by the weight of the water still inside and job done.

What a stupid problem, probably designed to make you either buy parts which won't work so you'll end up buying a new cleaner.