Hi again Denise,
If you let me have your e-mail address will send you a copy of the NHS Cleaning Manual, with the following advice - You must be extremely careful to follow ALL of your local PCT procedures, failure to do so could land you in serious trouble, you must also ensure that you are insured to carry out this type of work within medical/hospital premises. This sort of work is not for the faint hearted or inexperienced!
Regards,
Rob