Baked in hard water stains on windows- help?

[Johns_Gal]

Vinegar isn't touching them. I think I need something heavier.

Anybody have something that's worked for them?

[4MKfam]

C L R. It's a solution in a silver plastic bottle. This stuff. (http://www.amazon.com/Jelmar-CLR-CL-12-28-Ounce-Cleaner/dp/B00009EFEX/ref=sr_1_1?s=home-garden&ie=UTF8&qid=1348800215&sr=1-1&keywords=clr) :) We have nasty hard water, and this stuff works the best when straight white vinegar won't work. I've used it on shower floors (where the water pools and evaporates and leaves a hard water stain), and in our warm mist vaporizer, and it works great.
It's not natural/non-toxic, but on windows, I think it'd work okay. Are we talking inside of windows, or outside?

[Johns_Gal]

Outside. We bought this place in June, and the previous owner kinda didn't do much about hard water issues. My toilets = forever gross. :lol

Thank you, I didn't want to just go buy and arsenal of toxins. I'd rather handle them once and be done with it.