He's dead. His body has already been a tourist trap for 80+ years. Mutilating him further will solve nothing. Just put him in an unmarked grave somewhere, or better yet cremate him and scatter his ashes in some river like they did with Hitler.
Lenin was a naive idealist who saw his dreams of a new world flounder. He is a pitiful figure, a brilliant revolutionary and inept leader. He was outmaneuvred by Stalin, isolated and ultimately turned into a political prop. Destroying his waxen remains, held together with spit and make-up, would be a hollow gesture after all his ideas were exposed as wrong and all his monuments toppled.
Lenin's body would make a good urinal.