Okay, so the two techniques that you'll need for this method are the following:
The method for cleaning yourself:
(Iryō Ninjutsu: Kirei Tomo) Medical Technique: I clean all of me
Type: Supplementary
Rank: C-Rank
Range: Short
Chakra Cost: 15
Damage Points: N/A
Description: The medical shinobi fills his palms with small amounts of extremely aggressive chakra and runs them over the areas of his body he wants to clean of any microorganisms, harmful substances, etc. The chakra will eliminate any inert harmful substance or microorganism present on that area. Normally this technique is done on the hands and lower arms just before having contact with a patient but can be applied to the whole body in specific situations (before performing surgery, if the enemy is highly contagious, etc). After being done, the chakra automatically turns back to his regular, non-harmful and calm one.
For cleaning someone else:
(Iryō Ninjutsu: Kirei Itto) Medical Technique: I clean all of him
Type: Supplementary
Rank: B-Rank
Range: Short
Chakra Cost: 20
Damage Points: N/A
Description: The medical shinobi fills his palms with moderate amounts of semi-aggressive chakra and runs them over any areas of the patient’s body he wants to clean of any microorganisms, controlling the chakra flow constantly so it doesn't becomes too lethal. The area affected is 4 times the area of the users hands. After being done, his chakra automatically turns back to his regular, non-harmful and calm one.
You must always clean both yourself and that patient before any form of operation, particularly if there are open wounds to deal with. However, you might not be able to see any clear signs of contamination, so it is better to be safe than sorry.
You'll remember the vials I spilled on you last class? Your resistance as Medical-shinobi-in-training, isn't going to hold out much longer. I want you to first sanitise your hands and hen proceed to clean your partner... or patient in this case.
I'll need as much detail as you can bring to the table about what your chakra is doing, how you are mentally achieving that and exactly what you are aiming to do with each step. That is your homework, but it is to be submitted in this thread to avoid clutter ^^