Check out this window. I have had lots of success removing hard water with a microfiber pad and a little abrasive compound like bar keepers or rain x. This job calls for phosphoric acid. The glass is really bad and may need to be resealed once hard water is removed. You guys ever seen any thing like it 
1 Like
Always seal the window after the reconditioning.
We deal with hard water stain removal on daily basis here.
Here’s one pic of many I have shared on the forum.
5 Likes
Thanks for the tip. Any suggestions on sealing product? And do you think phosphoric acid will do the trick here? Kind of nervous cause this is a serious hard water stain
Tim
Let me make a suggestion to you, there are many great topics in the search function here in regards to hard water stain removal. That will answer almost every question you have on this topic.
If after you search and learned about hard water stain removal and you have something that you still don’t understand, hit me up in a PM, I’m more then willing to walk you through it.
3 Likes
Roger that
