I've used the anti fog like ring have told me doesn't work. I cannot wipe it if away. They have know about this problem for years and not done anything about it. Another person from ring said yes that's what happens when tempture drops. They don't tell you this when you read about the product. This is not fit for purpuse.
I think it's bad they are selling a product which doesn't work in winter. We had a problem when we was away with three people I think as couldn't see as misted over with a ladder and climb over the fence in the front into our back garden when we was away not nice when you need to see what's happening and you cannot see much