You can't kill antibodies. They are not alive, so you can't kill them.
Agree with Leah. They are just disinfecting the area they are taking the blood from. You are negative. Congrats.
I am not Teak, but I want to let you know that I had that test done before. They always wipe the area off with an alcohol pad to clean it.....it does not get rid of the antibodies, if the test said negative, you are HIV negative. Congrats!!! Try to move on!