How would I set a null value?

I' m just a hair picky and obsessive, but I want to turn off all remote access to dmz2 on my FG100A via CLI (it only shows ping access but I still want to tidy things up and disable it heheh) Right now it shows set allowaccess ping What would be the proper command to remove that? So far I have tried: set allowaccess none set allowaccess null set allowaccess deny set allowaccess 0 set allowaccess none of which work. I know it has to be something simple, just cant seem to figure out the proper cmd. A little help please?