Found this is on sale at Local Tesco in Airdrie for ££1.50 Bargain :)
RainX Anti-Fog Product Description
The RainX Anti-Fog is part of the RainX range, designed to improve your visibility when driving. Anti-fog is specifically designed to eliminate interior condensation, fogging and steaming, caused by wet weather, high humidity & temperatures changes.
Features & Benefits of RainX Anti-Fog
Eliminates interior condensation
Quick & simple to use
Suitable in wet weather, high humidity & temperature changes