Once you have an expectation of what to look for in the data--you find it
It doesn't mean you emerge squeaky clean and pure on the other side but you will at least appreciate the power of probabilities instead of absolutes and what we don't know about what we don't know...
We are not AIs, who, when finally implemented, will (putatively) be able to modify their own source code. The closest we can come to that is to be aware of what our reasoning is put together from, which include various biases that exist for a reason, and to make conscious choices as to how we use these components.
Bottom line : understanding where your biases come from, and putting that knowledge to good use, is of more value than rejecting all bias as evil.--Morendil