Obliterate

verb
make undecipherable or imperceptible by obscuring or concealing
“a hidden message”
Similar: obscure, blot out, veil, hide
verb
do away with completely, without leaving a trace
verb
remove completely from recognition or memory
“efface the memory of the time in the camps”
Similar: efface
verb
mark for deletion, rub off, or erase
“kill these lines in the President's speech”
Similar: kill, wipe out