Could this be the answer to problems of freezing water after we have left a property, been thinking that It could be used instead of salt provided its a clear liquid just dilute it and and splash some in doorways and paths ect, not sure of the cost yet as they are closed at the moment.
http://www.thermera.co.uk Oh just looked at the pic and it looks like its not clear but maybe there is a product similar that could be used.