We keep hearing that JB had ample opportunity to do either.
So if he laundered his bloodied clothes, where did this take place - Bourtree Cottage? Is it being inferred that he did this straight away? Did he have a dryer or did he hang his laundry out? Did he store his clothes before laundering them?
If he got rid of them, how come nobody stumbled across them dumped somewhere? Foxes or domestic dogs would have got to them, ripping the bags open etc.