no
If you are looking for more information on what do you do to get rid of rodents in the attic, the best place to look is on www.terminix.com they will get rid of them for cheap.
kill them
Bleach
Not if you want paint splatters in your attic.
Yes
To get rid of click beetles in the attic set a yellow container filled with water plus a little dish soap. The beetles will be attracted to the water and will climb in and drown.
You can use several different kinds of smoke to get rid of bees in your attic. One particularly effective method of smoking out bees is using large, concentrated amounts of incense smoke.
It will take ventilation and time.
You should proof the attic to exclude. There are all types of readily available nets, screens etc to keep them out.
www.batsinthehouse.com
Yes, bats are very social and will nest together in a cave, attic, belfry, or loft of a barn.