This link is dead (IT's back SEE EDIT BELOW), in fact it appears there is no borristhecat on github either.
Until this changes or is back online the only option is to change your driver to "Device" and then you'll have an option to delete children on the Device page.
EDIT: Someone shared the link again and it appears to be here: https://github.com/borristhecat/HUBITAT/blob/master/Drivers/Clean%20Device.groovy
