I actually suspect that purging is only
one way to clean (or cleans) data.
See e.g. 'Purging or sanitising is the removal of sensitive data from a system or storage device with the intent that the data can not be reconstructed by any known technique.[citation needed] Purging, proportional to the sensitivity of the data, is generally done before releasing media outside of control, such as before discarding old media, or moving media to a computer with different security requirements.' (
http://en.wikipedia.org/wiki/Data_remanence#Purging)My Groot Woordenboek Industrie & Techniek also gives 'clean up' for 'opschonen' (COMP. Context:
(van bestanden))