Lens condensation

I have read a few posts about the exterior of the lens on the door bell fogging up in this cold weather and thought nothing of it. Now it is happening to me and i'm pulling out what little hair I have left :slightly_smiling_face: . Looking out on a doorbell ring to see not a lot due to heavy condensation is not something I planned on when spending out on a video doorbell. Some of the answers are just not feasible, such as change location of the bell. Our front door is North facing and in the shade most of the day in winter. It has only started to be a problem since the temperatures have been hovering around 2C. What products are out there for UK users that people are having success with please? I've tried the water/ white vinegar/ washing up liquid and that doesn't work. Would windscreen products work? I presume unless you can wipe them and keep the product still on the lens, the image will still be blurry? Feeling like i've wasted a bit of money at the moment.