Behind Enemy Lines
Striker
Do you realise how much cleaning would have to be done for there to be no blood at the scene? More likely that Avery knocked the whole building down and rebuilt it, than that he cleaned it that well.
Maybe there wasn't that much blood in the first place? Some aspects of Dassey's statement have to be bullshit like, he's not the brightest for a start and he was clearly under pressure to tell a horror story. Doesn't mean that the basics aren't true though (i.e. she was raped, killed and burned).