You'll need a 32 oz spray bottle, water (I prefer spring as our local water is hard and leaves deposits), Dawn and rubbing alcohol. Fill the bottle with water up to the top where the narrow neck just begins. Add two drops of Dawn dish detergent (I found the blue one in this photo works best). Then add rubbing alcohol in the "neck" of the bottle (from the bottom to the top of the neck). Gently swish it altogether and you're done!
Try this out and please let me know how it works for you!