I purchased a new Acura and did not pretreat the car outside window glass surfaces with a product like "outdoor" Rain-X,,,and now my car windows, all, including the rear view mirrors , are permanently damaged by hard water mineral deposits from the garden hose. When brand new, i paid about $500 for "Perma-Plate", but quickly all the car windows were ruined by hard water mineral deposits.
I have tried S.C.Johnson's recommended vinegar
Windex, and it did not take these hard water mineral deposits from the garden hose in silicon valley off.
I tried warm vinegar and it did little good ,even with repeated treatments.
I took the expensive ,supposed upscale Honda Acura to an expensive car detailer and had the windshield buffed by hand machine, and there is little improvement at terrific expense.
If you have a brand new car,,,or brand new home inside glass shower enclosure, i recommend you use something like "outdoor" Rain-X ,,,to prevent hard mineral tap water deposits from getting hold and ruining your views,,,you must apply it often/monthly,until something better is invented,,,I am told i need to buy new auto glass all around !! Ridiculous.
