It is on the cards for us to do next weekend.
We used to try to do it twice a year, but have been lazy and now it is almost a year since we last cleaned our windows from outside.
It is a bit of a pain as we have a two story house, and climbing that ladder isn’t fun.
So:
I do it once a year; twice if they get particularly funky during the summer. I have two windows in the upper level, but we never go up there, so the windows are filthy and we don’t much care.
I’m having a problem with my tilty windows. I can get the bottom pane to tilt in but the top pane…I can’t figure it out.
I did the insides a few weeks back on a cold, rainy day. I’ll get around to the outsides soon.
I have been living here since 2001 and I have never cleaned them.
We wash them ourselves. And by that, I mean I do it myself. My wife cleans the entire house without complaint, including toilets, but she doesn’t do windows. I don’t mind; I think I get the best of that deal.
I use Windex with a wash pad thingy (size and shape of a squeegee, but with a fluffy cloth pad thingy that smears the Windex around and actually does the cleaning) and then squeegee it all off. I use a paper towel to wipe the squeegee dry in between uses, and also to get the griminess out of the jamb, wipe down the screens, etc. We replaced the windows several years ago w/thermopanes that flip in, so it makes things easier.
Inside and out 1x/yr, maybe a 2nd time on the insides only. We have a lot of windows so it will take me about 5 hours to do all inside and out. That includes getting on a ladder to do the inside and outside of the upper panes in the sunroom, which don’t open or flip inside.
I sort of enjoy it at the beginning of the process, then about half way through I grow weary of it but soldier on, because when I’m finished I love how clean and clear everything is. It’s the perfect early spring Saturday housecleaning activity.
I’m having issues with my tilty windows, too, Kalhoun. Sure, the bottom ones tilt out just fine. I just can’t seem to figure out the top part!
I guess I’ll have my husband show me how to do it, the next time he gets home.
Stupid windows.
Edited to add:
I like to clean the outside of the windows every couple of months, or so. But, since I haven’t been able to figure out the top half, they’ve only been cleaned on the bottom half.
The insides get cleaned once a month, I’d say.
When the windows have dog/cat wet-nose-spots all over them, it makes me want to clean them more often than I do!
nonacetone- generally it works like this: Raise the bottom pane a couple inches and flip it down. Then slide the top pane down about 6-8 inches or so and flip it down. You can flip the lower pane in by itself, but for the upper pane to flip in, the lower one has to be flipped in.
I do the insides of our windows at least once a week - I have a toddler and there always seems to be handprints and gloopy stuff on them. I do the outsides of our windows every few months. This sounds like a lot, until you find out that we live in a ground floor apartment and we have four windows + two sliding glass doors. The whole production takes me about 15 minutes. I use 50/50 vinegar and water, with a couple drops of tea tree oil and a rag. I find that dirty windows make the whole home seem a little dingy, even if the inside is spotless.
My husband can’t figure it out either. I just spray 'em good from the outside. I know I really should care more about the windows than I do, but…
I have cat noseprints, too. Cat boogers can be quite stubborn.
I’ve lived in my current house for twelve years.
So, that.
I’m with him, but we’ve only been in our current house for 11 years. 
Seriously, I clean the insides when the funk build-up is really getting on my nerves (doesn’t happen often; I have strong nerves!) but the outsides are such a PITA, I let them go. I’ve got more important things to worry about. (Which is not to imply that those of you who regularly clean your windows don’t have more important things; just that for me, this is very low on my priority list, waaaaaaaay down there after: what’s for dinner? Do we have clean plates to eat off of? Do we have clean underwear? Etc.) I guess for some people it’s a higher priority.
People wash windows? 
Well I moved in to this house in 2002. If I ever clean 'em I 'll let you know.
That’s about right for me, or would be if my landlords hadn’t replaced almost all the windows last year ::happy dance::. They flip open for easy cleaning, not that I’ve done any yet.
I’d say… once a year? Just did them yesterday actually, with a fantastic extendible squeegee that I got on sale last year, and a large bucket with a bit of dish soap in it. Then I was going over to my parents place for dinner, so I brought it along and did theirs too.
If you have the right tools, it doesn’t take very long, and it looks great when you’re done.
I’ve become a bit of a window-cleaning nutter, after years of slovenly not-cleaning. (In my defense, though, it took awhile of living up north before I learned that the sash windows are cleanable flip-ins, and longer still before I learned how to clean the whole outside-side of the outer pane, by flipping them both in. Never had those in Florida.)
I do the outsides about three times a year; the insides more frequently; and the inside of the kitchen window more frequently still (airborne grease). I used to use Windex, but got tired of the streaking (why do they add so much blue to their product? It just ruins it.), so now it’s just water and some spritzes of vinegar (from a spray bottle.) I also devote as much care to cleaning the screens and the sashes (inside and out, top and bottom, and even the inner grooves) as to the windows themselves - a bit of terrycloth rag penetrates well for the screens. And every few years or whenever they need it, some WD40 for the grooves.
The last time I visited my parents, I did some of their windows and sliding glass doors.
I can only get to three windows without a ladder, and they get washed several times in the summer – Windex and a lint-free rag. They’re the windows on the deck and they get dirty from the grill smoke.
The other windows – we’ve been here 6 years and they haven’t been washed. I can still see out of them.
Been in this house since 1986, and frankly it never even occurred to me until now to clean the wndows. I mean, why? We don’t smoke. Rain washes the outside. There are so many more interesting things to do than clamber around on ladders washing windows.
People used to have to wash their windows back when everyone was burning coal, because the air was full of soot and smuts, both inside and outside.
Not any more. [shrug]
What the what in the where now?
My mother never in living memory washed windows. I think Dad did a few times when he could no longer see the back porch through the dog snarf on the back door, but he was tall enough to look through the top panes and the dogs weren’t, so that took a while. I remember someone washing our sliding glass patio doors once and a dog immediately ran nose-first into them, so I don’t think anyone tried that again. My parents have been in that house since 1984.
I’ve generally been in student and other temporary housing since moving to college, so I’d say the windows generally go the length of an academic year before they make me move out and someone else washes them.
One of the other roommates in the current apartment cares WAY more than I do, so I just bought her a bottle of window cleaner this afternoon. Inside I imagine she’ll wash the windows once a month, but this being Arizona, most of the window outsides have thick sunscreens on them and usually aren’t worth trying to get to for washing.
We haven’t in the three years we’ve lived here. Then again, we don’t have pets and we usually keep a semi transparent Roman shade on most of them. We are replacing all the windows in the house anyhow since the ones we have now are junk.