Walk down a suburban street, and you might stumble across a following sign. It’s probably messy with poor formatting and inconsistent font size. Here’s one that I saw in Houston. Source One line stuck out to me. It reads, “Window cleaning in progress.” I love this board because it showcases something that most marketers forget. K&C Window Cleaning doesn’t try to persuade you with flashing slogans or in-your-face claims. They’re far more subtle, and that subtly makes them more effective. While ads are about influence, no one wants to be sold to. Instead, this sign uses psychology to get people thinking, “Other people are using the service, so maybe it’s time to clean my windows.” The idea feels organic and nothing feels forced. Table of Contents We follow the actions of others We don’t like to feel forced We follow the actions of others Back in 2008, the legendary researcher Robert Cialdini ran a notorious study .…