The key to the whole thing! Is not the key....

Just another post about the key.

Those on the dark side always state that TH's DNA was not on the key because Avery washed the key. He apparently had to wash the blood off the key but got his sweat DNA on the key.

If so then how did he get the blood out of the lanyard? Shouldn't there be blood there as well? Even if he washed it. It's clear it was not bleached. How did he remove the DNA from the lanyard? His own blood DNA and hers?

edit-corrected lanyard.