Rob, when you are dealing with specifically blood clean up the blood is or should be physically removed.
If it is in a carpet then the carpet area contaminated is cut out and then bagged and then disposed of, if through the underlay then the same thing. If it is furniture then the same procedure should be followed.
No machines are used as machines themselves exhaust into the ambient air that which has been picked up causing more contamination.
There isnt a machine that can be used to cause total removal which is why it is done as I have mentioned above.
If you or we are just cleaning a carpet that has blood in which happens daily I am sure then just normal cleaning is fine. But then, do you clean your machines every day or after every clean? Nor do I.
Simply and I know it isnt done, if we as cleaners are asked for total blood removal then a machine isnt used.
Hey, charge 200 quid if you want to for having to wear nitrile or latex gloves, thats justified, its just not justifiable to charge for cleaning a machine when it shouldnt have been used to be contaminated itself.
Best, Dave.