diff --git a/tools/internal_ci/helper_scripts/prepare_build_linux_perf_rc b/tools/internal_ci/helper_scripts/prepare_build_linux_perf_rc
index ec1ec1179d3..ff5593e031a 100644
--- a/tools/internal_ci/helper_scripts/prepare_build_linux_perf_rc
+++ b/tools/internal_ci/helper_scripts/prepare_build_linux_perf_rc
@@ -21,15 +21,8 @@ ulimit -c unlimited
 
 # Performance PR testing needs GH API key and PR metadata to comment results
 if [ -n "$KOKORO_GITHUB_PULL_REQUEST_NUMBER" ]; then
-  set +x
   sudo apt-get install -y jq
   export ghprbTargetBranch=$(curl -s https://api.github.com/repos/grpc/grpc/pulls/$KOKORO_GITHUB_PULL_REQUEST_NUMBER | jq -r .base.ref)
-
-  gsutil cp gs://grpc-testing-secrets/github_credentials/oauth_token.txt ~/
-  # TODO(matt-kwong): rename this to GITHUB_OAUTH_TOKEN after Jenkins deprecation
-  export JENKINS_OAUTH_TOKEN=$(cat ~/oauth_token.txt)
-  export ghprbPullId=$KOKORO_GITHUB_PULL_REQUEST_NUMBER
-  set -x
 fi
 
 sudo pip install tabulate
diff --git a/tools/internal_ci/helper_scripts/prepare_build_macos_rc b/tools/internal_ci/helper_scripts/prepare_build_macos_rc
index 7b9b02b6318..23619ecbb8b 100644
--- a/tools/internal_ci/helper_scripts/prepare_build_macos_rc
+++ b/tools/internal_ci/helper_scripts/prepare_build_macos_rc
@@ -25,16 +25,10 @@ export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/GrpcTesting-d0eeee2db3
 
 # If this is a PR using RUN_TESTS_FLAGS var, then add flags to filter tests
 if [ -n "$KOKORO_GITHUB_PULL_REQUEST_NUMBER" ]; then
-  set +x
   brew update
   brew install jq || brew upgrade jq
   ghprbTargetBranch=$(curl -s https://api.github.com/repos/grpc/grpc/pulls/$KOKORO_GITHUB_PULL_REQUEST_NUMBER | jq -r .base.ref)
   export RUN_TESTS_FLAGS="$RUN_TESTS_FLAGS --filter_pr_tests --base_branch origin/$ghprbTargetBranch"
-
-  # TODO(matt-kwong): rename this to GITHUB_OAUTH_TOKEN after Jenkins deprecation
-  export JENKINS_OAUTH_TOKEN=$(cat ${KOKORO_GFILE_DIR}/oauth_token.txt)
-  export ghprbPullId=$KOKORO_GITHUB_PULL_REQUEST_NUMBER
-  set -x
 fi
 
 set +ex  # rvm script is very verbose and exits with errorcode
diff --git a/tools/internal_ci/macos/pull_request/grpc_ios_binary_size.cfg b/tools/internal_ci/macos/pull_request/grpc_ios_binary_size.cfg
index 1c4f7b23109..dc35ce81ffd 100644
--- a/tools/internal_ci/macos/pull_request/grpc_ios_binary_size.cfg
+++ b/tools/internal_ci/macos/pull_request/grpc_ios_binary_size.cfg
@@ -17,7 +17,6 @@
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/macos/grpc_ios_binary_size.sh"
 timeout_mins: 60
-gfile_resources: "/bigstore/grpc-testing-secrets/github_credentials/oauth_token.txt"
 before_action {
   fetch_keystore {
     keystore_resource {
diff --git a/tools/run_tests/python_utils/comment_on_pr.py b/tools/run_tests/python_utils/comment_on_pr.py
deleted file mode 100644
index 399c996d4db..00000000000
--- a/tools/run_tests/python_utils/comment_on_pr.py
+++ /dev/null
@@ -1,37 +0,0 @@
-# Copyright 2017 gRPC authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-import os
-import json
-import urllib2
-
-
-def comment_on_pr(text):
-    if 'JENKINS_OAUTH_TOKEN' not in os.environ:
-        print 'Missing JENKINS_OAUTH_TOKEN env var: not commenting'
-        return
-    if 'ghprbPullId' not in os.environ:
-        print 'Missing ghprbPullId env var: not commenting'
-        return
-    req = urllib2.Request(
-        url='https://api.github.com/repos/grpc/grpc/issues/%s/comments' %
-        os.environ['ghprbPullId'],
-        data=json.dumps({
-            'body': text
-        }),
-        headers={
-            'Authorization': 'token %s' % os.environ['JENKINS_OAUTH_TOKEN'],
-            'Content-Type': 'application/json',
-        })
-    print urllib2.urlopen(req).read()