diff --git a/polkadot/scripts/build-demos.sh b/polkadot/scripts/build-demos.sh
deleted file mode 100755
index 285da143c17d..000000000000
--- a/polkadot/scripts/build-demos.sh
+++ /dev/null
@@ -1,28 +0,0 @@
-#!/usr/bin/env bash
-
-# This script assumes that all pre-requisites are installed.
-
-set -e
-
-PROJECT_ROOT=`git rev-parse --show-toplevel`
-source `dirname "$0"`/common.sh
-
-export CARGO_INCREMENTAL=0
-
-# Save current directory.
-pushd .
-
-cd $ROOT
-
-for DEMO in "${DEMOS[@]}"
-do
-  echo "*** Building wasm binaries in $DEMO"
-  cd "$PROJECT_ROOT/$DEMO"
-
-  ./build.sh
-
-  cd - >> /dev/null
-done
-
-# Restore initial directory.
-popd
diff --git a/polkadot/scripts/run_all_benches.sh b/polkadot/scripts/run_all_benches.sh
deleted file mode 100755
index 923013f35155..000000000000
--- a/polkadot/scripts/run_all_benches.sh
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/bin/bash
-
-# Runs all benchmarks for all pallets, for each of the runtimes specified below
-# Should be run on a reference machine to gain accurate benchmarks
-# current reference machine: https://github.com/paritytech/substrate/pull/5848
-
-runtimes=(
-  polkadot
-  kusama
-  westend
-)
-
-for runtime in "${runtimes[@]}"; do
-  "$(dirname "$0")/run_benches_for_runtime.sh" "$runtime"
-done