You can delete autosaves. deleting actual savegames, requires it to be selected.
For autosaves you can do that in the game launch actions.
delete autosave #?
or
if autosave #? exists
delete autosave #?
end if
you could probably also use Lua script to iterate through a bunch of filenames to see if they exist & if they do then delete them, but I'm not going to go into that as it requires using OS functions; & maybe even the LFS functions.