iptables --flush not happening code example

Example 1: remove iptables rule

#find line number of rule
$ sudo iptables -L INPUT --line-numbers
## delete rule by number
$ sudo iptables -D INPUT 1
. . .

Example 2: remove port iptables

# flag -D for delete
sudo iptables -D INPUT -i eth0 -p tcp --dport 22 -j ACCEPT