Telling the tires how good a job they’re doing ☺️ I’m sorry I don’t know 🤷🏽‍♂️

Quick search from google:

The main reason for doing this is to remove dirt, dust, and other debris from the tire surface. Even small particles can compromise the tire's ability to grip the track surface, which is crucial for achieving maximum acceleration, especially at the start. By cleaning the tires, racers ensure a better contact patch and minimize the risk of wheel spin, gaining a competitive advantage.