clean sheet

Noun

Meaning

An absence of debts or indictments.

(soccer) A game played without having conceded a goal.

Used other than figuratively or idiomatically: see clean,‎ sheet.

Source: en.wiktionary.org

The visionary starts with a clean sheet of paper, and re-imagines the world. Malcolm Gladwell

One clean sheet will not soil another. American Proverb