wipe the slate clean

• IPA^(key): /ˌwaɪp ðə sleɪt ˈkliːn/

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wipe the slate clean (third-person singular simple present wipes the slate clean, present participle wiping the slate clean, simple past and past participle wiped the slate clean)

1. (idiomatic) To make a fresh start, for example by forgetting about previous differences and disagreements.

• bury the hatchet
• draw a sponge over the slate (obsolete)
• pass a sponge over the slate (obsolete)

• hold a grudge

• clean slate

• turn over a new leaf