diff --git a/neutron/common/ovn/constants.py b/neutron/common/ovn/constants.py
index efbb8bcd603..8591f1f0b73 100644
--- a/neutron/common/ovn/constants.py
+++ b/neutron/common/ovn/constants.py
@@ -32,8 +32,6 @@ OVN_ROUTER_NAME_EXT_ID_KEY = 'neutron:router_name'
 OVN_ROUTER_ID_EXT_ID_KEY = 'neutron:router_id'
 OVN_AZ_HINTS_EXT_ID_KEY = 'neutron:availability_zone_hints'
 OVN_ROUTER_IS_EXT_GW = 'neutron:is_ext_gw'
-OVN_GW_PORT_EXT_ID_KEY = 'neutron:gw_port_id'        # DEPRECATED, DON'T USE
-OVN_GW_NETWORK_EXT_ID_KEY = 'neutron:gw_network_id'  # DEPRECATED, DON'T USE
 OVN_SUBNET_EXT_ID_KEY = 'neutron:subnet_id'
 OVN_SUBNET_EXT_IDS_KEY = 'neutron:subnet_ids'
 OVN_SUBNET_POOL_EXT_ADDR_SCOPE4_KEY = 'neutron:subnet_pool_addr_scope4'
diff --git a/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/maintenance.py b/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/maintenance.py
index 5d705560824..94b39d53a07 100644
--- a/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/maintenance.py
+++ b/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/maintenance.py
@@ -841,40 +841,6 @@ class DBInconsistenciesPeriodics(SchemaAwarePeriodicsBase):
             txn.add(self._nb_idl.set_router_mac_age_limit())
         raise periodics.NeverAgain()
 
-    # TODO(fnordahl): Remove this in the B+3 cycle. This method removes the
-    # now redundant  "external_ids:OVN_GW_NETWORK_EXT_ID_KEY" and
-    # "external_ids:OVN_GW_PORT_EXT_ID_KEY" from to each router.
-    # A static spacing value is used here, but this method will only run
-    # once per lock due to the use of periodics.NeverAgain().
-    @has_lock_periodic(
-        periodic_run_limit=ovn_const.MAINTENANCE_TASK_RETRY_LIMIT,
-        spacing=ovn_const.MAINTENANCE_ONE_RUN_TASK_SPACING,
-        run_immediately=True)
-    def remove_gw_ext_ids_from_logical_router(self):
-        """Remove `gw_port_id` and `gw_network_id` external_ids from LRs"""
-        cmds = []
-        for lr in self._nb_idl.lr_list().execute(check_error=True):
-            if (ovn_const.OVN_GW_PORT_EXT_ID_KEY not in lr.external_ids and
-                    ovn_const.OVN_GW_NETWORK_EXT_ID_KEY not in
-                    lr.external_ids):
-                # This router have none of the deprecated external_ids.
-                continue
-
-            external_ids = lr.external_ids.copy()
-            for k in (ovn_const.OVN_GW_PORT_EXT_ID_KEY,
-                      ovn_const.OVN_GW_NETWORK_EXT_ID_KEY):
-                if k in external_ids:
-                    del external_ids[k]
-
-            cmds.append(self._nb_idl.db_set(
-                'Logical_Router', lr.uuid, ('external_ids', external_ids)))
-
-        if cmds:
-            with self._nb_idl.transaction(check_error=True) as txn:
-                for cmd in cmds:
-                    txn.add(cmd)
-        raise periodics.NeverAgain()
-
     # A static spacing value is used here, but this method will only run
     # once per lock due to the use of periodics.NeverAgain().
     @has_lock_periodic(
diff --git a/neutron/tests/unit/fake_resources.py b/neutron/tests/unit/fake_resources.py
index 49821b17812..1fff1766333 100644
--- a/neutron/tests/unit/fake_resources.py
+++ b/neutron/tests/unit/fake_resources.py
@@ -906,7 +906,6 @@ class FakeOVNRouter(object):
             return subnet_id
 
         external_ids = {
-            ovn_const.OVN_GW_PORT_EXT_ID_KEY: router.get('gw_port_id') or '',
             ovn_const.OVN_ROUTER_NAME_EXT_ID_KEY:
                 router.get('name', 'no_router_name')}
 
diff --git a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_maintenance.py b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_maintenance.py
index 0664a0cbf28..52c72450046 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_maintenance.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_maintenance.py
@@ -918,33 +918,6 @@ class TestDBInconsistenciesPeriodics(testlib_api.SqlTestCaseLight,
             'NB_Global', '.',
             options={'fdb_removal_limit': ovn_conf.get_fdb_removal_limit()})
 
-    def test_remove_gw_ext_ids_from_logical_router(self):
-        nb_idl = self.fake_ovn_client._nb_idl
-        # lr0: GW port ID, not GW network ID --> we need to remove port ID.
-        lr0 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
-            'name': 'lr0',
-            'external_ids': {constants.OVN_GW_PORT_EXT_ID_KEY: 'port0'}})
-        # lr1: GW port ID and GW network ID --> we need to remove both.
-        lr1 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
-                'name': 'lr1',
-                'external_ids': {constants.OVN_GW_PORT_EXT_ID_KEY: 'port1',
-                                 constants.OVN_GW_NETWORK_EXT_ID_KEY: 'net1'}})
-        # lr2: no GW port ID (nor GW network ID) --> no action needed.
-        lr2 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
-                'name': 'lr2', 'external_ids': {}})
-        nb_idl.lr_list.return_value.execute.return_value = (lr0, lr1, lr2)
-        self.fake_ovn_client._plugin.get_port.return_value = {
-            'network_id': 'net0'}
-
-        self.assertRaises(
-            periodics.NeverAgain,
-            self.periodic.remove_gw_ext_ids_from_logical_router)
-        expected_calls = [mock.call('Logical_Router', lr0.uuid,
-                                    ('external_ids', {})),
-                          mock.call('Logical_Router', lr1.uuid,
-                                    ('external_ids', {}))]
-        nb_idl.db_set.assert_has_calls(expected_calls)
-
     def _test_check_baremetal_ports_dhcp_options(self, dhcp_disabled=False):
         cfg.CONF.set_override('disable_ovn_dhcp_for_baremetal_ports',
                               dhcp_disabled, group='ovn')