Originally Posted by bill_de
When windshield washers first came out, GM supplied a bottle of concentrate that was stored in a clip of the wheel well. One capful and fill with water. One bottle would last for years. Now, we buy the water. Isn't shipping all that water a waste of money?
GM Optikleen is still available as concentrate, but since the GC doesn't have a two bottle system, you have to BYOW. If you have a water demineralizer you might be able to avoid mineral spots where it inevitably runs into places and evaporates.
Or, you could just go to one of the high priced botiques such as Tarj'ay or Walm'Art and pick up a gallon for between a buck to two bucks.
In the winter, if you have problems with super heavy icing, you can add a bit of medicinal ethyl alcohol to help cut ice clumps. Don't use methanol and don't overdue the ethanol, but it does help cut the buildup around the edges of the windshield in ice storms. Suspect good 'shine would work, but don't have good local access.
I think the prohibition against RainX is for the wax stuff you wipe onto the window as it could interfere with the rain sensor. Dunno if their orange juice washer fluid has any of that in it or not....