Usually when it's raining, or first thing in the morning my windscreen develops a thick layer of condensation/fog up on the inside.

My car doesn't have a heater setting for the screen and the airflow isn't great at getting rid of it quickly either.

I've tried starting on cool then working or to hot air, reversed and plain cold air and it seems to be the same

I don't want to wipe it away due to smearing it and leaving marks.

I can't have the window down if it's raining and if cold in the morning the kid in the back will get cold.

I have tried using those anti condensation things on the dashboard but that is limited success.

I have a clio 15 plate.