First, list the rules in all chains with numeric IPs:
iptables -n -L
e.g.:
Chain fail2ban-apache-noscript (1 references)
target prot opt source destination
REJECT all -- 85.241.169.238 0.0.0.0/0 reject-with icmp-port-unreachable
RETURN all -- 0.0.0.0/0 0.0.0.0/0
Remove banned IP in selected chain:
sudo fail2ban-client set apache-noscript unbanip 85.241.169.238