Roof Cleaner

Roof Cleaners can be bought from Crazy Dave at his shop for $3000. These are basically Lawn Mowers, except for the Roof. If you do not purchase the Roof Cleaner and a zombie gets past your defenses, it will go down your chimney and eat your brains. For this reason, it is a good idea to buy them as soon as you begin the Roof stages. If a zombie touches a Roof Cleaner, the Roof Cleaner will drive down the lane and run over any zombies it meets. This is true for Gargantuars as well, even though other instant kills, such as Squashes or Cherry Bombs, will only get rid of half its health. This may suggest that the Roof Cleaner (as well as the Lawn Mower and Pool Cleaner) are the strongest weapons in the game. However, it is not a good idea to depend on them too much.

Trivia

 * It is unknown how Roof Cleaners can kill Zombies, as they are just motorized brushes.
 * The achievement Pyromaniac cannot be unlocked if the Roof Cleaner is used.
 * In Level 5-10 and the mini-game Dr. Zomboss's Revenge, the Roof Cleaner can be destroyed by Dr. Zomboss's Fireball or Snowball.
 * When this happens, a biting sound happens, despite not being eaten. However, this may simply be a crushing sound.