Does anyone know where I can find a research article about patients healing faster in clean environments?

Answer 1

There are many researches on that. Visit the link below and check on the details of the selected published researches down the EVIDENCE BASE (however,links are not online ).
http://patientexperience.nhsestates.gov.uk/healing_environment/he_content/healing_environment/introduction.asp

Check on Effects of Healthcare Interior Design on Wellness: Theory and Recent Scientific Research
http://www.hort.vt.edu/human/cnhrt340.htm

See this summary also:
http://search.yahoo.com/search?fr=slv2-msgr&ei=UTF-8&p=Discomfort%20to%20Environmental%20Noise%3a%20Heart%20Rate%20Response%20of%20SICU%20Patients

Answer 2

Sure... here's a good one:

The impact of environmental cleanliness on infection rates.
Nurs Times. 2004 Jan 6-12;100(1):32-4.