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This is my current solution to sensor fogging.
Inside the heat resistant sleeve is 10R dew heater. Take a length of nichrome and wind it tight around the leg of a 1W resistor. Slide the wound end off as you go and wind some more. This makes a nice little spiral heater element with a good range of voltage/heating control once stretched slightly to separate the coils.
Insert into sleeve and bend at the corners - solder a couple of thin wires capable of handling a few amps. Fixed as shown with the clear gel double sided tape from Jaycar. It's a bit tight - next version will be a tighter coil.
This works really well. A bit too good, so it needs to be run at a voltage adequate for the level of cooling.
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