No it will not 'clean" the THC from your system.
Plasma is the portion of your blood that will absorb active THC
and wastes after it has been metabolized.
Donating plasma only removes a small portion of your total
plasma. In Canada a plasma donation is ~450mL and your body has
anywhere from 6 to 8 liters of blood at any given time.
You will lower the concentration of the THC in your system but
not by a significant amount.