Data cleansing is just like scrubbing off unnecessary data in your database. Doing so will optimize the chance of inquiring and jumping into incorrect information about your client. This is actually critical same critically as operating with a contaminated hands.
In the sense of data scrubbing or cleansing, there are consideration that have to be taken out before you can go and dump a certain data. This process requires full attention from your data specialist and not only that it also takes some verification from a third party before deleting those information.