Worth every penny.

Detailed Image really needs to add a "Maybe" button to their review pages.

I had an extremely water spotted black GMC Terrain to detail. I bought Optimum MDR to deal with the spotting issue.

I followed the directions on the label and it didn;t even put a dent in the spotting. The directions stated apply with a microfiber towel, rub it onto tareaa being cleaned for sixty seconds, wipe off and re-evaluate. I did this twice and nothing really happened. Then I got an idea, I applied the MDR to a microfiber cutting pad and used my Griot's Boss 15 polisher to remove the spotting. That worked great and I was able to eliminate 98% of the water spots. There were a couple of areas where they were reduced but not totally eliminated.

I'll withhold criticism but bought it to clean home windows. First use has not removed spots but I will try it again with more elbow grease. My sister's window cleaner recommended this and he is younger (stronger) so I will give it one more try. I have a lot of windows, some more spotted than others. I'll follow up.

Works well to keep Optimum Gloss Coat clean - but you have to clean surface FIRST with Optimum Paint Prep (the normal suggested cleaner for Gloss Coat) before using Mineral Deposit Remover. On first use I did not do this and had less than stellar results from MDR. Tried again a few days later by cleaning Gloss Coat first with Paint Prep, then using MDR, then cleaning residue with Paint Prep again - worked great - ALL water spots gone and restored high shine / hydrophobic surface - bug residue just wipe away easily from renewed surface. I use Wolfgang Uber Rinseless Wash, or ONR as maintenance, but step up to Paint Prep to deep clean and renew surface. Add MDR when I have water spots to remove. Using Paint Prep and MDR does not degrade Gloss Coat - quite the contrary, it makes the surface look like it has been newly coated. If you have Gloss Coat then Paint Prep and MDR are your friends!

Gave this a try and didn't work as expected. Let it sit per directions with minimal results on type 1 waterspots. Made a couple passes as well. Goes on easy will try different technique before I give up

Used this product to remove water spots from front fenders hood and front grille. Worked great and did not remove wax. Finish clean up was perfect, a little product goes a long way.