It’s spring cleaning time.

A respite from travel for most of the NASCAR community will offer the opportunity to refresh and regroup over the next two weeks with races being held at Charlotte Motor Speedway.

Sprint Cup crews were already busy tweaking cars following an extensive technical bulletin which was released last week prompting teams to immediately schedule wind tunnel time. Several of the changes – including shortening the side skirts on the car – have already been studied during Goodyear tire tests.