Filch vs. House Elves

[grindieloe]

No: HPFGUIDX 54614

I was just listening to CoS again, and I came to the part where Harry 
gets in trouble for slopping mud all over the floor as a result of 
Quidditch practice.  This is when he finds out that Filch is a squib, 
and Harry gets invited to Nick's Death-Day Party.  

Anyway, I believe that Filch is so angry with Harry because he 
doesn't feel good and he now has to scrub the floors for an extra 
hour.  My question is... what about the House Elves?  Aren't they the 
ones that wander the castle making sure things are clean?  Aside from 
keeping an eye on students, is cleaning one of Filch's main jobs?  If 
so, why?  You'd think that the hundred or so house elves would be 
able to handle the castle... even with the extra mud!  

Sorry if this has been discussed or covered before, but it just 
occurred to me today.

grindieloe