W9 Water Spot Remover for Cars, 8.45 fl oz | Advanced Solution Easily Removes Stubborn Water and Silica Spots from Bodywork, Suitable for Glass, All Paint Types and Vinyl

My husband's car was parked by a sprinkler, and we have very hard water, which left water spots horribly on the right side hood fender and partially on the door. I had tried vinegar and other products to try to remove it to no avail. We were told it would have to be professionally buffed out. I received this product today and used it only on the hood and the upper part of the metal between the driverside door and windshield. It completely removed the water spots!! You do have to use a little elbow grease if they are really stuck on there, aka baked on, but it worked and is totally worth the effort! I read comments prior to purchase, and the bad reviews stated it only smells like vinegar, which it does, but I can smell other chemicals in this bottle. As others have commented, this is more than glorified vinegar.

My black truck had to sit outside after getting ceramic coated. I followed instructions to not wash but lightly spray off for major things like bird droppings that could not sit on the paint. After the first was nearly 3 weeks later, I realized I had a pretty significant water spotting issue. Especially on the roof. Washing and light buffing did not help. After doing a bit of research, I found Gtechniq W9 to be highly recommended by several. I'd used some of their other products and the price was right so I gave it a shot. Magic. Significant mineral deposits that were not coming off came off immediately. I let the product sit for no more than 10 seconds, wiped right off and it vanished. Amazing. Highly recommend this product.

Doesn’t work at all. Can’t see no difference everytime i use it.

Was hoping this simple product would work on my dark blue Mercedes van as I watched it on a YouTube video. It had been ceramic coated, but developed bad water spots. nothing else removed (vinegar did nothing alone). It does take quite a bit of rubbing and applications. Each time the spots got less until the third application did take it off and looks great again. It was a lot of hand rubbing and product (will have to order more), but the detailer said they would have had to buff it out ($500.) and then reapply ceramic coat. Hopefully the coating is till intact and does bead up nicely after a ceramic detailer was applied after the w-9. So far, pleased even though a lot of work with carefully washing, drying and the applications. No way to tell without trying!

It works great removing water spots from paint with no effort. Recommended.

I've been a fan of Gtechniq products for a while, but this one just doesn't live up to the hype. I have some moderately difficult water spots on my car's windows and paint, and I was hoping this would be a simple, quick fix as advertised. Unfortunately, it barely touched the spots, even after multiple applications and a lot of elbow grease. It seems to work well on very fresh, light spots, but for anything that's been there for a while, you're better off using a vinegar solution or a more aggressive polish. It's a lot of money for a product that only works on the easiest of water spots.

It works wonderful, and would highly recommended, consider that the spots were on top of my ceramic coat

I just received the W9 Water Spot remover and it works ok. Not overwhelmed by the results.

The water marks on my vehicle were tap water and the fact that the water PH was relatively high. This leaves very visible marks on the surface. This product removed them with ease.

It's ok at what it does, but I wonder if it's worth the money? You still need to apply a fair bit of effort to remove any water stains and I don't know if it's more effective than any other spot remover/detailer that you could use for small areas. Anyway, I've given it a try and it does work, just not sure that I'll buy it again.

I bought this product specifically to remove water spots from my car's windshield and windows, and it was a complete failure. I followed the instructions carefully, tried multiple applications, and even used extra elbow grease — nothing. The water spots didn’t fade even a little bit. Not only did it not work, but it also left behind streaks and a hazy film that made the glass look even worse. The smell was strong and unpleasant, and the overall experience was just frustrating. For something advertised as a water spot remover, it did the exact opposite. Total waste of money and time. I’ve had better results using homemade vinegar solutions. Don’t bother with this — it’s all hype and no results.

Don't remove water spots on my car so not good for me ....

Very good