The way I applied rainx in the past has been tried and true for me here in Mn. It helps drastically with cutting down ice on windows too.
Step 1. Go get Rainx aerosol spray window cleaner in the can with rainx in it and a bottle of actual Rainx.
Step 2. Clean window with Rainx window cleaner really good.
Step 3. Apply Rainx as per its directions.
Step 4. Repeat steps 2 & 3 ....3 to 4 times. Ending with Rainx obviously the last time you do it.
Step 5. Watch Rainx at its finest when the weather is inclement.
Good luck.
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