"Wiped the slate" is an idiomatic expression referring to clearing one's past mistakes or starting anew. However, there are several other synonyms or phrases that could be used to convey a similar meaning such as "start from scratch," "turn over a new leaf," "begin with a clean slate," "erase the past," "reset the balance," "reset the clock," "hit the reset button," "bury the hatchet," or "forgive and forget." These phrases emphasize the idea of leaving behind past mistakes or conflicts and starting afresh. Overall, the use of such phrases signifies the importance of moving forward, letting go, and starting anew.