- * Applies all the cleaning options we can (eg duplicate key ids) to a
- * list of keys. Returns 0 if no changes were made, otherwise the number
- * of keys cleaned.
+ * Applies the requested cleaning policies to a list of keys. These are
+ * specified from the ONAK_CLEAN_* set of flags, or ONAK_CLEAN_ALL to
+ * apply all available cleaning options. Returns 0 if no changes were
+ * made, otherwise the number of keys cleaned. Note that some options
+ * may result in keys being removed entirely from the list.