I tried every suggestion in this post and nothing worked for me. I live in New Hampshire and it makes sense stains will be different depending on where you live. Finally, I found the solution ...a pumice stone. There are several brands available online. I found this one in my local grocery and hardware store, and it's pretty inexpensive. Just use with water ..it didn't take a lot of muscle....just a little patience but it worked beautifully. I had gone so far as to get a quote for replacement shower doors and stumbled on this product just before I was ready to place the order. So glad I tried it because new doors were more than $800. Just wanted to share in case it helps someone else!

Is this a a frameless door? Have you considered that unless you hang up the towel on the outside bar perfectly EVERY time, it will likely look a mess. Part of the point of a frameless door (in my opinion) is to show off what is behind the door, not to mess up the view with hanging towels. I would seriously reconsider putting a towel bar on a frameless door. I just think towel bars are meant for the wall not a frameless door. Just my opinion.

I have hard water too so I know how ya feel. The most effective way to deal with really hard water and laundry is to get some sodium tripolyphosphate (STPP). If you do not want to use phosphate, your only alternatives are Washing soda, Borax, or Oxi Clean. You said your son had sensitivities and you were trying to convert your home to less chemicals. You also said your husband likes scented laundry. Your only solution for that may be something like Seventh Genration Laundry detergent or some other natural brand that has a scent. You can also buy natural fabric softeners that have scents if that helps. If you can not get a hold of natural fabric softner, your only alternative would be vinegar in the rinse. However, I have no idea if that would take the perfumed smell out of the laundry. Personally, if it was me. I would buy an all natural unscented detergent to wash my clothes. Go buy some febreeze and hand it to my husband and inform him, "Your son has sensitivities. You want scented clothes? Here ya go. Just don't spray it by him." (I have a husband that can be a big baby too, as I like to term it. HA! He had a fit when I got our new front loader and I couldn't use his favorite detergent anymore. I basically told him if he didn't like it he could take the laundry to a laundry mat and wash it there. Of course he said no...so I told him to shut up about it then. Not a complaint since. HEE! HEE!) As for the shower here are some things you can try that have worked for me. Buy some Charlies Soap All purpose Cleaner. You can get it at www.charliesoap.com . If you do not want to do that then get a scrubby sponge and some Ivory or Lye bar soap. Rub the scrubby side of the sponge on the soap and scrub the glass doors and get it good and sudsy. Do a small section at a time so the soapy suds do not have time to dry. Then rinse in hot water. Then go over it again with full strength white distilled vinegar. This works well on greasy stove tops too. Actually you can use Ivory or Lye soap to wash everything and anything if ya know what you are doing. I had to when I was first married and my hubs and I bought and moved into our first home. Didn't have money for fancy cleaning supplies so I washed everything with ivory soap. LOL! It worked.

Our shower doesn't have a door, and that side faces our vanity and mirror above. I've never really thought about it when I'm taking a shower. I certainly see myself after I get out but by then I have a towel wrapped around me so it's not as scary. And yes, the mirror gets fogged up if I'm in there long enough. Rereading your post I will say that we also have a pony wall next to the shower opening and that wall has glass above and that glass gets fogged up a lot faster than the mirror. So I would think that would happen to your glass shower door as well.