Nuf Said!

[admin@MikroTik] > ip firewall filter print
Flags: X - disabled, I - invalid, D - dynamic
0 ;;; pepito de los palotes grandotes
chain=forward action=accept src-address=1.2.1.2 log=no log-prefix=""

[admin@MikroTik] > ip firewall filter disable [find comment="pepito de los palotes grandotes"];

[admin@MikroTik] > ip firewall filter print
Flags: X - disabled, I - invalid, D - dynamic
0 X ;;; pepito de los palotes grandotes
chain=forward action=accept src-address=1.2.1.2 log=no log-prefix=""

[admin@MikroTik] >

Listo!