The most effective way to remove hard water spots is a product with the chemical called hydrofluoric acid you can find this product usually from a professional detailer but please be advised that this chemical is dangerous and toxic and to be used in moderation at 2' intervals for the least aggressive approach use a liquid rubbing compound by hand or machine polisher and then follow after compound application with a good polish to bring back the luster
The best way to remove hard water spots off cars is to use a mild acid solution. This will gently lift off the hard water stains and reveal the paint underneath again. See the proven step by step method below:
Formula to Use:
½ liter white vinegar and ¼ liter of water
Method to Use:
1.Fill a clean spray bottle with pure vinegar
2.Spray the vinegar/water solution on small areas of the car and wait for a few minutes
3.If stains are stubborn spray more solution and wait a while longer
4.Scrub lightly with a soft sponge or cloth and rinse
Tip:
Try to deal with the water spots straight away as the solution works best with newly formed or mild hard water spots. Once the stains are gone, use a specialist car wax to coat the surface of you car to prevent them forming again.
You might try disolving 3 tablespoons of baking soda in a bucket of warm water; lightly sponge on vehicle , rinse then wash. be sure to towel dry to avoid new spotting. If spots have already etched into finish this will not remove them
how is to dry it in the car wash is the answer.
Some parts of the country are burdened with extremely hard water. Hard water is water that contains excessive trace elements including calcium, iron, lime, and other minerals found in streams and rivers. These trace elements remain on your glass when water from sprinklers or washing air dries. These hard water spots attach themselves to glass like white on rice. If left on your glass for very long, hard water spots will not wash off with shampooing or regular glass cleaners. In my experience, there are only two ways to remove hard water spots. The first is to use distilled white vinegar. If your water spots are mild, you can dilute the vinegar 2:1 with water. Heavy spots may require pure vinegar. Either way, the vinegar will not harm you or your car. Vinegar is a very mild acid, which dissolves the alkaline-based mineral water deposits with ease. If hard water spots are allowed to remain for more than a week or two, they may etch the glass. So, even though you have removed the minerals causing the water spots, the spots remain as damage to your glass. In these cases, it is necessary to polish the glass. Until recently, there were a number of glass polishes on the market. The two best products were Eagle One Glass Polish & RainX Glass Polish. However, both of these products have been discontinued due to little demand. In my experience, any light (low abrasive) car polish that does not contain paint feeding oils will work as a good glass polish. Eagle One Scratch Remover is a good example of a polish that does not contain oils and works well on glass, as does P21S Multi-Surface Finish Restorer. There are two ways to use these polishes. The most gentle is to use an old t-shirt to polish the spotted area and buff to full luster. The second is to use the polish with #00 or finer synthetic steel wool to remove the spots then buff with an old t-shirt. If your glass is heavily pitted, or mildly scratched, you can also use polish to restore the finish. In this case, it may be necessary to use a buffer in order to achieve the desired results. In some cases, the glass may be so deeply pitted, etched, or scratched that the inevitable must occur, you must replace the glass.
You won't get that hard shell finish that turtle was is famous for.
Depending on the type of water, this can be a tough job.Some of the products other people have found valuable are Rain-X (to protect before the spots happen), Spot-X, C-30 Water Spot remover, Zaino Z-12 Clear-View Glass Polish, Mr Clean - Magic Eraser, Mothers Chrome polish, 3m microfinishing compound, Spot Not, clay bar, Mr Clean Autodry sprayer, Invisible glass, PPG's AquapelOther people recommend fine steel wool or a glass polishing kit.Some of the causes of water spots are hard water, parking next to a sprinkler, or washing your car in the direct sunlight.(Note PPG was purchased by Trico Products and is now called Trico View - see below)Video: How do you remove water spots from a car windshield?
It depends on where the water is coming from or if its filtered. water usually has a hardness and contains stuff like iron and fine dirt which leaves spots. if you filter your water it should help also try the Mr. clean auto car wash tat attaches to your hose and prevents water spots. another thing you can try is go to an RV retailer and pick up a hose filter that they use on RV'S for water filtration again this goes on the end of your hose and is a cheaper way to prevent spots
white vinagar or a scratch remover wax. good example meguairs scratchx
Jacob needed a master cylinder to finish his car in Twilight.
White vinegar has been proven to work to remove hard water stains from car windows. See the step by step method below...Natural Formula to Use:½ liter white vinegar and ¼ liter of waterMethod to Use:1.Fill a clean spray bottle with pure vinegar2.Spray the vinegar/water solution over the window and wait for a few minutes3.If stains are stubborn spray more solution and wait a while longer4.Scrub lightly with a soft sponge or cloth and rinseTip:Try to deal with the water spots straight away as the solution works best with newly formed or mild hard water spots. Be careful to wipe all of the vinegar off afterwards as it may damage the paintwork if left on for too long.
It will speed up the rusting of bare metal. Just hose off the car with straight water
Usually it is just a tougher version of wax. It is used to preserve the finish, or to shine the finish, of a car.
WD-40 will remove pine sap from a car's finish without causing damage to the car.