Before you say it... It's not because its low!

It started the other day - the gong comes on at random times while driving to scare the **** out of me, every time I drive it now. I hate that thing.

The only sensor I can see is on the 'Intensive' washer fluid box. I unplugged it (or tried to) by pulling up on it and pulled out the big black thing its attached to (guessing this is a pump or something)... When the water came flowing out of the hole I quickly plugged the black thing back in the hole, held it and removed the electrical connector properly checked it and re-connnected it. The intensive washing thing hasn't worked since I bought it but it doesn't bother me in the slightest, I just want the gong and warning to F-off. If there's any ideas why the intensive cleaning is dormant however, I'd be interested to hear them.

Any quick fix or am I looking at a faulty sensor here? I should probably clean out the 'tanks' anyway to be honest. The jets on the bonnet keep getting blocked somehow. Probably time for new ones but they are expensive for such small parts...

The tanks aren't leaking just incase thats a suspect.