windows smudged and wont come clean..?

[bgable]

my front window has smudges all over it i clean the inside and out side twice and it still has what looks like water marks and smudges everywhere? i use stoners invisible glass and a microfiber rag?

[fluke]

I get that sometimes too from hard water. I use the exact same thing you do - invisible glass and microfiber. I just scrub really hard and it usually comes off. If some is left though I get it off with NAPTHA. Just be careful and follow MSDS ( NAPTHA MSDS Sheet ). It's great for taking off tree sap, oil, road tar, etc. It WILL strip your wax though if you use it on a painted surface, but you can just add it again. You should wash off the surface after you use it too.