The most common and most likely answer to this crossword clue is the 6 letter word ENEMAS
I've seen this crossword clue in The Daily Telegraph
E
N
E
M
A
S
More clues leading to the result ENEMAS
Buddy explains!

The straight part
We know that "Cleansing procedures" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cleansing procedures = enemas.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ENEMAS mean?
ENEMAS noun- An injection of fluid into the large intestine by way of the rectum, usually for medical purposes.
- The fluid so injected.
- A device for administering such an injection.