Why does Montag instruct Faber to burn some of his belongings and clean the rest?

Montag instructs Faber in order that his scent might be completely removed, making it more difficult or even impossible to track him. Most importantly, Montag didn't want Faber to be caught and killed.

"Wait. There's no use your being discovered. When I leave, burn the spread of this bed, that I touched. Burn the chair in the living room, in your wall incinerator. Wipe down the furniture with alcohol, wipe the door-knobs. Burn the throwrug in the parlour. Turn the air-conditioning on full in all the rooms and spray with moth-spray if you have it. Then, turn on your lawn sprinklers as high as they'll go and hose off the sidewalks. With any luck at all, we can kill the trail in here, anyway..'