Are you remotely aware of the pathogens that can be released into the air dealing with a dried blood stain ESPECIALLY of the size that you're describing!
Tyvek suit, goggles, mask gloves, booties. Should use a tub vacuum cleaner exhausted outside anything else will get platelets airbourne indoors. On completion of the job all outerwear should be bagged up and taken to local hospital for incineration.
If the person who deposited the blood has any form of blood illness - inhalation of any airbourne platelets can lead to your system absorbing said illness! It's that serious. 
Obviously all this has to be accounted for within the job cost. To be honest, since I found out about this from Paul Pearce who was invited to a seminar on blood bourne pathogen dangers I wont clear blood. Just because you can't see it don't mean it's not there!
Just watching out for a fellow CC
Alan
Sorry as this is off subject!!!
Hi Alan,
Sorry haven't been on site for a while, Thanks for the information! I never knew of the dangers. The blood was from an elderly lady who fell and cut her knee. Can you please either contact me on 01502 732558 or by email as in my details or give me your contact details.
Kind regards,
Jason.