I hope you find something to clean your glass door. Another thing I suggest you may want to put on your to-do list is to re-aim or replace the offending sprinkler head so that it doesn't hit your house at all.

So far I've tried the glass cleaner that comes in the aerosol can, vinegar & water and vinegar straight, and bar keepers friend (soft scrub), all using a micro fiber cloth. No luck.

Thank you for pointing out the obvious, Elmer. We did that, but when the wind blows it still hits the porch.

Yeah, sorry, so what it is, is that you know the cause but have the damage all the same. The water deposits on the glass may not be the only damage.

Is there anyway to prop vinegar soaked paper towels against the door so it can soak the spots and dissolve them?

I had that same problem and Simple Green worked great. It was on some windows, I soaked them good with it and used a brush, then hosed it off, they dried spotless!

The spots are calcium and can be dissolved by vinegar. Lacking that solution, maybe try good sharp new razor blade?

I have this eternal problem on my shower. We recently replaced the glass, after many years of etching. I found that the regular can of Bar Keepers Friend takes the mineral deposit off without damaging the glass. I tested in a tiny area at the bottom corner, and then in a larger area, and it seems fine.

Windex can handle mild cases of water spots. Instead of going the acidic route (vinegar), try something basic like ammonia with detergent. Use household ammonia and wear dish washing gloves. Ammonia will loosen greasy finger prints as well. It works for removing floor wax.

My last house had some really tall windows that I never cleaned because I could not reach them, They were sunbaked. We tried a lot of stuff on them. Finally as a last resort, we tried Comet. It's a last resort because it can etch the glass. We only used it that one time and it worked.

We have the sprinkler problem with the wooden front door. I tried to get the builder to varnish it under our home warranty. He wouldn't because he said the sprinklers were too close. Well duh! His sprinkler crew put them there.

We recently installed glass shower doors and the installer told us about a squiggee that one can use to clean the glass which eliminates spots. We have used it faithfully after every shower and we are very pleased with the result

There's a recipe online for the best outside glass cleaner and it includes using the rinse agent you use in the dishwasher and it works great. I will try to find it but to keep the spots from happening the rinse agent prevents spots.

Rinse agent window cleaning

Rain X Extreme Clean.

I've heard to add jet dry to your window washing materials and it'll stop the spots. Haven't tried it, but it makes sense!

ETA: almost the same as Raven's! Must be worth trying.

I'll give that a try, if I ever get the spots off! Thanks all!