The Sanitisation of Grease

"Why this musical is automatic, it's systematic, it's highhhhly-sanitised. Why, it's Greased Lightning!"

From 1971 through to today, Grease has become well-known as a staple musical for all ages, with it being a popular choice to be performed at high schools, being still one of the sing-a-long movie experiences, and even still being a popular costume choice for parties due to it's sheer iconicism. Everyone knows someone with a pink lady jacket.
But, would it be as widely-published if it's original Chicago production was the production we knew today? Could we accept a meaner Sandy? The non-existence of famous numbers like 'You're the One that I Want'? Patty the cheerleader somehow being a main character? Well, let's take a look at Grease's history from a dark piece of Chicago's biographical teenage issues through to it becoming a suburban, wholesome and family-friendly piece of commercial theatre.