here is an easy way to beat cletus in the gun store.
1st make sure u have one or two small chainsaws with u that u get from adam the clown
2nd make sure u have at least 1 coffee creamer or orange juice with u
3rd make sure u have a pistol or submachine gun

k when u go in to fight him hide behind the rack o the left 
the he will move to the edge of counter on the left side and when he stops to reload move
the rack closer to him
after ur close eonugh and he reloads again pop out the mini chainsaws and give him a good
slash and then run back behind the rack
after u slash him he may take a few steps back away from the edge of the counter so when
he reloads shoot him once with the pistol and then get back behind the rack so that he
moves up again to the edge of the counter
then once again just slask him when he reloads

repeat this process until he dies

later on 3 humans will be in there

so get a nail gun when they are in there and open both doors and stand outside the store
and then shoot them until they defect and come outside at u
when they do this u can let the zombies kill them for u or u can hit them with the lead
pipe found near by
afer u kill them one drops a shot gun another drops a pistol and then the other drops a
machine gun with 150 shots but make that one last cuz its the only u get

now u should have an unlimited amount of shot guns and sniper rifles so enjoy