diff --git a/rootfs/usr/local/bin/certbot-cleaner.sh b/rootfs/usr/local/bin/certbot-cleaner.sh
deleted file mode 100755
index 78021d67..00000000
--- a/rootfs/usr/local/bin/certbot-cleaner.sh
+++ /dev/null
@@ -1,90 +0,0 @@
-#!/bin/sh
-
-# based on https://github.com/jlesage/docker-nginx-proxy-manager/blob/796734a/rootfs/opt/nginx-proxy-manager/bin/lecleaner
-
-BASE="/data/tls/certbot"
-live_dir="$BASE/live"
-archive_dir="$BASE/archive"
-csr_dir="$BASE/csr"
-key_dir="$BASE/keys"
-
-# Set of certificate paths actively used.
-in_use=""
-
-keep_count=0
-delete_count=0
-error_count=0
-
-remove_file() {
-    f="$1"
-    if rm -f "$f"; then
-        return 0
-    else
-        echo "ERROR: Could not remove $f." >&2
-        return 1
-    fi
-}
-
-# Build the set of certificates in use.
-for domain_dir in "$live_dir"/*; do
-    [ -e "$domain_dir" ] || continue
-    if [ ! -d "$domain_dir" ]; then
-        continue
-    fi
-    for certlink in "$domain_dir"/*; do
-        [ -e "$certlink" ] || continue
-        if [ ! -L "$certlink" ]; then
-            continue
-        fi
-        target=$(readlink -f "$certlink")
-        in_use="$in_use $target"
-    done
-done
-
-echo "----------------------------------------------------------"
-echo "Let's Encrypt certificates cleanup - $(date +"%Y/%m/%d %H:%M:%S")"
-echo "----------------------------------------------------------"
-
-# Remove all unused certificates from the archive directory.
-for domain_dir in "$archive_dir"/*; do
-    [ -e "$domain_dir" ] || continue
-    if [ ! -d "$domain_dir" ]; then
-        continue
-    fi
-    for certfile in "$domain_dir"/*; do
-        [ -e "$certlink" ] || continue
-        if echo "$in_use" | grep -q "$certfile"; then
-            echo "Keeping $certfile."
-            keep_count=$((keep_count+1))
-        else
-            echo "Deleting $certfile."
-            if remove_file "$certfile"; then
-                delete_count=$((delete_count+1))
-            else
-                error_count=$((error_count+1))
-            fi
-        fi
-    done
-done
-
-# Remove all files from the csr and key directories.
-for dir in "$csr_dir" "$key_dir"; do
-    for file in "$dir"/*; do
-        [ -e "$file" ] || continue
-        if [ ! -f "$file" ]; then
-            continue
-        fi
-        echo "Deleting $file."
-        if remove_file "$file"; then
-            delete_count=$((delete_count+1))
-        else
-            error_count=$((error_count+1))
-        fi
-    done
-done
-
-echo "$keep_count file(s) kept."
-echo "$delete_count file(s) deleted."
-if [ "$error_count" -gt 0 ]; then
-    echo "$error_count file(s) failed to be deleted."
-fi
diff --git a/rootfs/usr/local/bin/start.sh b/rootfs/usr/local/bin/start.sh
index 719605d2..63f41e78 100755
--- a/rootfs/usr/local/bin/start.sh
+++ b/rootfs/usr/local/bin/start.sh
@@ -483,7 +483,20 @@ if [ "$CLEAN" = "true" ]; then
             /data/logs \
             /data/error.log \
             /data/nginx/error.log
-    certbot-cleaner.sh
+    rm -vf /data/tls/certbot/crs/*.pem
+    rm -vf /data/tls/certbot/keys/*.pem
+
+    certs_in_use="$(find /data/tls/certbot/live -type l -exec readlink -f {} \;)"
+    export certs_in_use
+    # from: https://www.shellcheck.net/wiki/SC2044
+    find /data/tls/certbot/archive ! -name "$(printf "*\n*")" -type f > tmp
+    while IFS= read -r archive
+    do
+        if ! echo "$certs_in_use" | grep -q "$archive"; then
+            echo "$archive"
+        fi
+    done < tmp
+    rm tmp
 fi
 
 if [ -s "$DB_SQLITE_FILE" ]; then