How to clear iptables rules

I am using the following script to clear all iptables rules. I use the script when I am debugging my iptables rules.

#!/bin/bash


/sbin/iptables -P INPUT   ACCEPT
/sbin/iptables -P OUTPUT  ACCEPT
/sbin/iptables -P FORWARD ACCEPT
/sbin/iptables -F
/sbin/iptables -X

for table in filter nat mangle; do
    /sbin/iptables -t $table -F
    /sbin/iptables -t $table -X
    /sbin/iptables -t $table -Z
done