This week, NASCAR notified crew chiefs about the Sanctioning Body’s updated rules for cleaning pit boxes during the race weekend.
Previously, teams would use all manner of tactics and chemicals to ensure as much grip as possible in their assigned stall, looking for any possible advantage while aiming to prevent cars from sliding through their boxes.
But as of March 12th, cleaning of pit box surfaces can now only be done with hand tools, and no chemicals can be used to help with the process. Any cleaning or scraping that could damage the pit box surface, or even more importantly, damage timing loops or discolor any painted lines of the box, will not be permitted.
See more at Motorsport.