That's precisely the problem of Kaggle. The data is mostly cleaned for you. This...

eanzenberg on Oct 30, 2017 | parent | context | favorite | on: The State of Data Science and Machine Learning

That's precisely the problem of Kaggle. The data is mostly cleaned for you. This is most of the job of a DS in industry. Cleaning your data improves performance way more than working hard on optimizing your ML algo.