That means it’s still grabbing too much dirt. Re-read the article. Mike said to use plenty of cleaner...that’s the lubricant...and it will stop the towel from grabbing and pulling off the tool. That is, unless you’ve already stretched the elastic. There’s ways around that too.
Mike’s mention of using the rising or setting sun is a great tip. Can’t always do that though and I’m sure he knows that. Often time and timing just doesn’t allow for it.
If you’re in a building, maybe even working at night by yourself, and have a small low power light source, or even a high power source on a stand, then you have a way to double check your work without the need of a second person.
Set the light source up outside of the car, to the side, the front, or the back. The further away the better. Turn off the garage/shop lights and turn ON your light source. Next, climb in the car and double check your work real quick. You are likely to get a surprise the first couple times you tackle windows that are really bad.
If you’re working on a car with trashed up windows like in Mike’s article, especially cars heavily smoked in, you’re likely to miss some spots the first few times you tackle these types of windows until you figure out your technique. That is, the process, the tools, the products, and your technique. I have worked in some where every window product I had did not even come close to touching it.
One example was in a Tahoe I detailed where the guy who owned it was a cigar smoker. I really thought I had cleaned those windows really well. I was finishing up at night time and replacing some mats in the back when the wife turned the garage lights off on me by accident. The outside streetlight was shining through the windows and revealed the work was far from finished. You should have seen the pile of filthy towels I had already used before this had happened. The windows were so bad I started trying all my other window products and literally found none that removed ALL of the film. I was just moving it around. What I did next was risky, but a test spot proved it worked. I had to resort to using 90% ISP alcohol. It was the only thing that would cut through the film. It was the last resort. The customer raved about the glass being clean more than any other part of the job.
Moral of the story...LOL...
What’s done in darkness will be brought to the light.