error in find on daily output disk clean

[Dave]

Hello,
    One of my periodic.conf checks is running the daily disk cleaner. When 
it uses find it is looking in my jail area, which has device files and other 
virtual items that are not existing. I am getting output from find in the 
output to that effect. I'd like to tell find in that script not to look in 
my jail area, to exclude it.
Thanks.
Dave.