There are a lot of way for money laundering but bitcoin is the best way among all the way of money laundering and for becoming favorite of bitcoin is one of the main reason is money laundering.
Each transaction can be tracked by government or by someone else who want to know the transaction.
The point of view a new people to bitcoin is fully anynomous but it is wrong, as you may know how many bitcoin mixer which has considered as the best place to be use a money laundering was closed just because the transaction can be tracked.
So, for me bitcoin is not the best place to be use as money laundering, the viewpoint other people was wrong here. You need to look another cryptocurrency which was designed as anynomous place for its user maybe it is monero or something else.