diff --git a/scripts/docker-install-phase4.bash b/scripts/docker-install-phase4.bash
index 70ba663..69fe156 100755
--- a/scripts/docker-install-phase4.bash
+++ b/scripts/docker-install-phase4.bash
@@ -5,6 +5,7 @@ set -o pipefail
 
 npm config set unsafe-perm true
 PERL_MM_USE_DEFAULT=1 cpan App::cpanminus
+rm -rf /tmp/cpan_install_*.txt
 
 # Befunge
 npm install -g befunge93 prompt-sync
@@ -36,4 +37,6 @@ pip3 install whitespace
 # Wolfram Language
 python3.7 -m pip install mathics
 
+rm -f /tmp/core-js-banners
+
 rm "$0"
diff --git a/scripts/docker-install-phase5.bash b/scripts/docker-install-phase5.bash
index 5bce5c1..4ccbe29 100755
--- a/scripts/docker-install-phase5.bash
+++ b/scripts/docker-install-phase5.bash
@@ -12,6 +12,7 @@ rm watchexec-*.deb
 cd /tmp
 git clone https://github.com/circulosmeos/gdown.pl.git
 mv gdown.pl/gdown.pl /usr/bin/gdown
+rm -rf gdown.pl
 
 cd /tmp
 wget https://get.haskellstack.org/stable/linux-x86_64-static.tar.gz
diff --git a/scripts/docker-install-phase6.bash b/scripts/docker-install-phase6.bash
index 83c3efb..cc0efa2 100755
--- a/scripts/docker-install-phase6.bash
+++ b/scripts/docker-install-phase6.bash
@@ -5,6 +5,8 @@ set -o pipefail
 
 uid="$1"
 
+rm -rf /tmp/hsperfdata_root
+
 if [[ -n "$uid" ]] && (( "$uid" != 0 )); then
     useradd --uid="$uid" --create-home --groups sudo docker
     passwd -d docker