Amazon.com: Chemical Guys SPI10816 Heavy Duty Water Spot Remover, Safe for Cars, Trucks, Motorcycles, RVs & More, 16 fl oz

I tried this on my car first with heavy water spots and it didn’t work. Then i tried it on my Nissan rogue that has light water spots and it did work. So in the end it works on newer water spots but so far not on older heavier spots that have been on paint for a few years.

I was a little skeptical buying this product since I read the 1 star reviews and it either didn't work at all for some people or left a permanent cloudy glass for folks that used it on their showers. Well I wasn't using it on my shower, I have a car where the left side has been hit by sprinklers for years. I had tried vinegar, I tried lemon juice. Those home remedies did absolutely nothing. These water spots wouldn't budge even the slightest and it was really annoying me. I decided to give this product a shot. I followed the instructions and even bought their microfiber applicator to use it. To my delight it actually removed some of the water spots!One thing to note though, you really should only do a few inches at a time. And this is because when you get tired you can stop. If you do the whole window then you'd best not leave the product on in it's waxy state for too long, since some folks said they couldn't get it off and there is no recommendation for how long the product should stay on the glass. So do it in small sections. Be prepared to use a lot of elbow grease. It's not easy getting the film off once it dries and I had to smash that microfiber into the glass like an eraser to rub that film off. But underneath it is mostly clear glass. I've done about 3-4 continuous treatments on the windows and all but the most stubborn spots are gone. There are still some spots remaining which is why I'm giving this is 4/5. But this is the only thing I've tried which even comes close to clearing the windows.

My husband was upset at the water spots on our cars from sprinklers (very hard water) while we had to use the garage for storage. Nothing seemed to remove them so we ordered this and it worked so well. He was worried about paint damage but seems we got the water spots off on time and the cars looks perfect now. Easy to use though takes some time if following the directions accurately. Worth it.

I'm frankly surprised this stuff works as well as it does. It took a good deal of elbow grease, but I'm taking it a few square feet at a time. Eventually, I was able to completely remove the hard water spots and embedded dirt from parking next to the sprinklers for a few months.I do suggest being careful to not leave it on for too long (and neutralize it with soapy wooder.) I also noticed some very light orange stains that I eventually removed with some sanitizing wipes.Still, it's infinitely better than it was, and worked equally well on the car's paint, hubcaps, and windows/mirrors. I think I'm be able to finish the one side of the car that has the spots with a single bottle, but I'd but this product again if we're stupid enough to park by the sprinklers again.(Attached pictures show the type of water spots and dirt I was dealing with, a partially cleaned door, small section of cleaned hubcap, and a fully cleaned door. I've obviously got a lot more work to do, but I don't think it'd be possible without a product like this.)

This gel worked perfect on glass! Had stubborn water spots that wouldn’t come off. I took it to a detailing shop and they wanted to charge me $200 because they needed to “polish” the glass. I ended up trying this gel first and I’m glad I did. It took all of the spots right off! My glass looks new now and it only took about 10 minutes per window. Don’t apply it in direct sunlight though. And work in small areas, I highly recommend it