TCO, sysprep will do nothing to your rad problem mate. If you still want to use pastel get the blitz and be done with it and do it properly. If you don't want to use pastel anymore then you don't need the blitz. Flush the loop with distill until you have not residue of the orange left. Fill, recirculate drain - repeat until no trace is left. Don't waste your time with sysprep it will accomplish you nothing.