Rot is an organism, its alive , possibly a plant, bleach kills by removing the oxygen and works. Antifreeze may work, its a poison, but bleach I know works, is cheaper, easier and safer to use and be ready to paint. Bleach residue is easily washed as it is salt, antifreeze has an oily residue, you don`t want to paint over any residue that will affect a paints bonding . Im sure alot of poisons will kill rot, even rot gut booze. Mold is usualy present with rot and may be the organisms responsible for rot. Bleach is still a safe bet for repainting. I just used 20 gallons on a repaint to kill rot and mold and clean concrete all with a garden sprayer. With antifreeze you may need soap to remove the oily residue, put it on your hands to find out, with bleach after its dry you just rinse with water. If you have rot you still must remove it, paint won`t last even if the rot is inactive, the wood is to soft and will absorb moisture, ruining the paint. I would cut out the rot then use bleach to kill whats left. Look for black spots on the house, even pinhead size, if you have them its mold and should all be sprayed with bleach. Mold is a plant you don`t want to paint over it.