C4GP - disable screen washer timer

Hi all,

My other half recently got a C4GP and discovered last week that on a long motorway run in nasty weather on salt covered roads it's quite possible to empty the entire washer bottle thanks to even wanting a little bit of water on the screen to clear a bit of salt means you get the full 3 or 4 second spray from the jets.

has anyone ever tried / managed to disable or bypass the washer timer circuit on a C4, or is it buried in the bowels of that annoying BSI box that seems to run everything in modern mobile computers (sorry I mean cars...)

Any pointers appreciated

Thanks,
Martin