Hard water spots

[jclays]

Hard water spots on boat glass.
How do you guys remove old hard water spots on your glass. Very stubborn. Almost seems etched in the glass.

 

[richardschmidt2759]

clean glass

try bar keepers friend. only thing worked on my car windshield, rub like hell ! works!!

 

[Russell Clifton]

There are products made for this. Look at your local auto parts store or Amazon.

 

[Dougcole]

I had really good luck buffing the glass with 3M perfect it medium grit. I used a white wool pad on my random orbital buffer. It worked well on the chrome frame around my shower door as well.

 

[Seevee]

I had the same issue, and most window cleaners didn't work well. But scrubbing with Scotch Bright worked fine, but a bit of elbow grease.


Once done, coated with Rain X and future cleanings went well.

 

[caltexflanc]

Start with toothpaste. Then try Wright's silver/jewelry polish or the like (Prism Polish et al). I've never had to go beyond that to get results. Handy stuff for stainless and other metals when bad.

 

[JDCAVE]

If it’s a hard water spot perhaps try a small dab of muriatic acid on a disposable cloth. Try a small section of the window first and then flush with water. If it’s calcium carbonate, it will dissolve immediately.

Jim