There is a lot of positive results on Rain X that I have read from the other post. I have a few bottles that are a couple years old that I will be using next time I detail my car.

I also found a bottle of Rain X windshield washer additive. Its a concentrated bottle thats pink. Has anybody used this before or have any comments on it?

I havnt used a whole lot of it in the past and dont really remmeber the results. Rain X was causing problems with the wipers on the car and was time consuming with the frequent reapplying so I stopped using it and kind of forgot about the extra bottles I had.

Put everywhere on glass exterior-wise. Don't put it on the windshield next time. It lasts about 4-5 rain days or car washes then, you have to put it on again.