When we had a run of below zero temperatures in years past, I fitted both a rad blind, Bowden cable operated for a quick warm up, and as I posted yonks ago:.......
Extra screen washer pipe.
Suitably routed on the inner wing.
Coiled around the top hose, the more coils the merrier.
Covered the coils in cooking foil first, and then wrapped self- amalgamating black tape around the assembly.
You'll need a couple of in line wee pipe connecters to compensate for the increased length required.
Cheap remedy for those who as we were on a tight budget?
Never let us down even in the worst of freeze ups, (when they skated on the Fen floodplanes by the Dog in A Doublet) boy was it a keen wind that blew across those flat Fenlands from the East in past years?
Fitted the same DIY remedy on mine and the missus car year after year for minimal cost?