English use - from the New Shorter Oxford Dictionary:

antibiotic /%antIbVI"QtIk/ a. & n.

m19. [f. anti- + Gk biotikos fit for life, f. bios life: see - otic.]

A adj. ?1 Doubting the possibility of life (in a particular environment). 
m-l19. 

2 Injurious to or destructive of living matter, esp. micro-organisms; of or 
pertaining to antibiotics. l19. 

B n. A substance which is capable of destroying or inhibiting the growth of 
bacteria or other micro- organisms; spec. one that is produced by another 
micro-organism (or is a synthetic analogue of a microbial product), and is used 
therapeutically. m20. 

So, for my pennorth, CS does not meet the specific noun definition.

Terry

  ----- Original Message ----- 
  From: Marshall Dudley 
  To: [email protected] 
  Sent: Tuesday, September 17, 2002 3:06 PM
  Subject: Re: CS>FTC regulations?


  I believe by convention an antibiotic that is used on non-living things is 
called a disinfectant.  The dictionary says that an antibiotic is anything that 
kills some forms of life. 
  Marshall