Ken, how much is "some" Dawn dishwashing liquid ? I just purchase Rain-X windshield washer and the original Dawn dishwashing liquid. I'm ready to make my mixte but I don't want to add too little or too much. Do you measure your quantity or can you give me an estimate for a one liter bottle ? So far I was using Windex and this is fine but I am open to try a cheaper alternative if it work as good or maybe even better.

Thanks,
Séb