diff --git a/scripts/custom_dc/cleanup.sh b/scripts/custom_dc/cleanup.sh
new file mode 100755
index 0000000000..2da89c2b95
--- /dev/null
+++ b/scripts/custom_dc/cleanup.sh
@@ -0,0 +1,78 @@
+#!/bin/bash
+# Copyright 2023 Google LLC
+#
+# 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
+#
+#     https://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.
+#
+# This script cleans up all resources in a Custom DC GCP project.
+# Usage: ./scripts/custom_dc/cleanup.sh <project id>
+set -e
+
+PROJECT_ID=$1
+if [[ $PROJECT_ID == "" ]]; then
+  echo "PROJECT_ID environment variable is required."
+  exit 1
+fi
+
+WEBSITE_ROOT=$PWD
+
+if [[ -n "$DOMAIN" ]]; then
+  echo "DOMAIN environment variable is required."
+  exit 1
+fi
+
+TF_STATE_BUCKET=$PROJECT_ID-terraform-state
+
+# TODO(alex): Delete BT automation resources.
+
+# Delete everything managed by website_v1
+cd $WEBSITE_ROOT/deploy/terraform-datacommons-website/examples/website_v1
+
+terraform init \
+  -backend-config="bucket=$TF_STATE_BUCKET" \
+  -backend-config="prefix=website_v1"
+
+# Remove helm state in legacy instances
+if $(terraform state list | grep module.k8s_resources); then
+    echo "Found Terraform state for legacy helm resource, deleting."
+    terraform state rm module.k8s_resources
+fi
+
+terraform destroy \
+  -var="project_id=$PROJECT_ID" \
+  -var="dc_website_domain=$DOMAIN" \
+  -var="mixer_githash=9c7a2bd" \
+  -auto-approve
+
+# Cleanup local terraform dir
+rm -rf .terraform
+
+# Delete all objects without resource bucket
+# Terraform cannot delete non-empty buckets.
+gsutil -m rm -a gs://$PROJECT_ID-resources/** || echo "Resource bucket is empty."
+
+# Delete everything managed by setup module.
+cd $WEBSITE_ROOT/deploy/terraform-datacommons-website/examples/setup
+
+terraform init \
+  -backend-config="bucket=$TF_STATE_BUCKET" \
+  -backend-config="prefix=setup"
+
+# TODO(alex): add support for deleting setiups with custom domain
+terraform destroy \
+  -var="project_id=$PROJECT_ID" \
+  -auto-approve
+
+# Cleanup local terraform dir
+rm -rf .terraform
+
+echo "Cleanup finished."
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