"Apparently, Brendan had helped Avery clean the garage floor with bleach and there was bleach on Brendan's pants," Sheriff Hermann told THR.
This bit of information was also in Kratz’s opening statement from Dassey’s trial: “Brendan, himself, hands over to Investigator Fassbender his jeans. He says, these were the pants I was wearing that night, and these pants are splashed with bleach from cleaning Uncle Steve’s garage.”
The Dassey defense responded that though bleach was found on Brendan’s pants and he did help Avery clean the garage, it was to clean up a lawnmower spill, not Halbach’s blood like both Kratz and Hermann insinuate.
“They go into the garage, and there’s a small area behind the lawnmower as if something had spilled,” Dassey’s trial lawyer Mark Fremgen said in his opening statement. “Steven takes from gasoline and pours it onto this little area, and they use some clothing, old rags, that sop up the mess, and as they begin to clean it up with these old clothes and old rags, they throw them onto the fire, and they do that for about a half hour. Steven tries some gasoline and paints — paint thinner to help clean up the area, and some bleach as well.”