I noticed recently that my heated rear window no longer demists the whole window. I am aware that a product that can be bought that repairs the most likely broken circuit.
With mine i think that over time the circuit has eroded away and even it it were repairable the line that would actually heat up would only be a partial part on the window. With out the boring details of how and why this occurs, i have been working on the problem.
I have a potential product that would not only complete the broken circuit but heat up again making full use of the demister again..Its pretty much a done deal but need to carry out some testing. Application could be tricky and it would have to be cured with a hairdryer...Does anyone show any interest in this..could it be worthwhile manufacutring?

Guss