You can’t post link. You have to explain it in your own words.
Context is everything. We could delve into the scientific/clinical meaning, but that probably wouldn’t help on a window cleaning forum.
In the context of window cleaning, in an absolute sense I would say it means free of any traces of dirt, grime, smudges, streaks, etc., etc.
From a practical standpoint, it would mean free from any traces of dirt, grime, smudges, streaks, etc., etc. that are detectable by a “reasonably picky” customer.
What I mean by “reasonably picky”, is that they would be observant, but not as OCD as I am 
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Why not?
Ask my wife and you’ll get a completely different answer than I’ll give you. She has to clean the house from top to bottom once a week or it eats on her. I just have to make sure everything is in it’s place, which is where ever it happens to be at that time. 
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I hate to say it but when we “clean” a window it is really not clean. Just hit it with pure water and you will see how parts are hydrophobic and some parts are water loving. A truly clean glass surface is hydrophylic not hydrophobic. This is only a concern if the glass is being chemically treated or coated in some way.
Good question Bubble Guy.
Henry
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“Clean” is relative.
Squeaky clean? Pretty much assured of that.
Sanitary clean? Not likely, but clean enough.
Deep clean? If they request that service.
Standard clean? A very noticeable difference with no dirt or smudges on the glass, but did they pay for mineral deposit removal, abundance of paint removal?
Guess it depends on what level you are talking about.
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Clean is removing just enough dirt for the customer to go “wow!”
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How does the dirt get removed?
I don’t know… 
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Lol.
I ask because as soon as we pour soap into a bucket and add water, we all become scientists, the experiment being conducted on the glass.
But what is really happening on the glass?
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@aviloria any input?
There is definately some science to it,i remember a good few years back when i was on facebook.There was a community simialar to this one and there was 2 guys that were claiming they were about to make a breakthrough with nano technology and water that could possibly change the game entirely.Now i deleted facebook not long after that so i never did find out if said breakthrough ever actually happened but it did sound pretty good,they could be members on here for all i know!
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clean i think streak free not disinfected. also i would imagine that a window cleaned with pure water is cleaning than squeegee.
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YOU define clean.
When i do a quote my quotes state the service on offer is a general window clean and states that no construction debris or hard water stain will be removed.
The windows are “CLEAN” when I am finished.
However on my CCU quotes the services offered is a construction clean where the glass will be brought to an “AS NEW” condition (where possible)
So your view of clean may not be the same as my view as clean but I set the parameters for my business and you will for yours.
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The water and solution suspends the contaminants the washer sleeve/brush agitates and break the surface tension between the contaminants and the glass surface then the rubber or water rinse removes the larger contaminants from the glass.
Is this the answer/direction you were thinking…@TheWindowCleanse
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The question itself is not specified enough and there are multiple was to answer what do we define as clean in general, scientifically, to the customer, different levels of clean. In the end the only thing that matters is that the customer perceives the window to be clean according the expectation that I stated in the bid
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What he said. ^^
English is a fun language because a single word can have multiple meanings in multiple contexts. “Clean” is about as easy to define as “nice”. It can mean tidy and well-arranged, it can mean there is little or no visible soiling, or it can mean sanitary and sterile.
Clean is in the eye of the beholder. Kind of like the old “Tree falls in the forest” philosophy. If I leave a tiny nick of crud in a corner, but the customer never sees it, then is the window still clean?
P.S. I’ve yet to encounter a customer requiring their windows be sterilized. And I’ve worked for some retired Nazis, no joke.
P.P.S. Take this comment for what it’s worth. It’s probably a bit off the wall. I’ve been up all night with an allergic cough and my brain is sleep-deprived and muddled with antihistamines. So…
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Yes indeed. The power of an open question is tremendous and it is interesting to me where people decide to take the answer.
But for the sake of not talking in circles, I’m really driving at the science. @wcs began to touch on it.
Why the science? Because, for years, I’ve dreamt about being able to use technology to do something like scan the window with a laser or something and clean the window that way.
But I always dismissed the idea because, “what do I know?”
Until I started researching the answer to the title of this thread. I would ask myself quite often, “What am I actually doing?” I’m going through the motions of cleaning but what is actually happening on the surface?
I’m dong maintenance cleans, so the windows pretty much look clean when I show up but at the end of the day, there is dirt at the bottom of my bucket. (when I was using a bucket) So, I guess I’m doing something?
To take it a step farther, when I spray bleach on a toilet seat and wipe it off, did I clean it? Did I sanitize it? Did I disinfect it? Did I sterilize it? How do I know? Even if I meticulously follow the instructions on the bottle, did I really clean it? How do I know for sure?
I wish we had molecular vision so we could actually SEE what we are doing and the results or lack thereof.
To illustrate, if I take up a batting stance with a bat and someone else throws an imaginary ball to me and I swing and “hit” the ball, and someone else “fields” the “ball” and throws it to first base and “beats” me by a step, are we playing baseball? Or are we just going through the motions?
My point: Once we know what is actually happening molecularly, then we are in better position to revolutionize the way we work. At present, we are doing things the same way they did them in the 30’s. How many of us would be satisfied with 1930’s technology in other areas of life? Our Dr.? Our Dentist? Our phones? Our TVs? Our cars?
I’m ready to put my squeegee to rest for good. Yes, but what about WFP and Pure Water? Ok, now we’ve moved into the 1950’s, Tucker being the first company to use it.
PW technology is not the be-all/end-all. Look at how many problems are still encountered by the user.
And what about one of the biggest problems we all deal with - h2o? How many issues/challenges can you name which are directly linked with water as our medium?
What about cavitation?
What about ultrasonic? What if we added this to WFP?
More to come, but gotta get going.
So are you thinking cavitation bubbles coming out of the brush?
