Well it isn't in the help file, but some time ago I tried using the -r switch with no address to clear the aop, avoice & protect lists, like with the /ignore command, but the lists weren't cleared even though it said it was. It works in 6.21 & 6.3, it doesn't work in 6.31. I noticed this a few weeks ago, another post today reminded me to report it.

/aop -r
-
* Auto-Op list cleared
-

/avoice -r
-
* Auto-Voice list cleared
-

/protect -r
-
* Protect list cleared
-