diff --git a/CMakeLists.txt b/CMakeLists.txt
index 90df4b3935..48095702a3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -916,8 +916,6 @@ install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/share/demo DESTINATION ${NRN_INSTA
 install(FILES ${PROJECT_BINARY_DIR}/share/nrn/lib/nrnunits.lib
               ${PROJECT_BINARY_DIR}/share/nrn/lib/nrn.defaults
         DESTINATION ${NRN_INSTALL_SHARE_DIR}/lib)
-install(PROGRAMS ${CMAKE_CURRENT_SOURCE_DIR}/share/lib/cleanup
-        DESTINATION ${NRN_INSTALL_SHARE_DIR}/lib)
 
 # Copy NEURON headers that will be included in the installation into the build directory.
 set(headers_in_build_dir)
diff --git a/share/lib/cleanup b/share/lib/cleanup
deleted file mode 100755
index 5ac223906d..0000000000
--- a/share/lib/cleanup
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/usr/bin/env bash
-
-if [ $TEMP ] ; then
-	tmpdir=$TEMP
-else
-	tmpdir="/tmp"
-fi
-rm -f $tmpdir/oc"$1".hl
diff --git a/src/oc/hoc.cpp b/src/oc/hoc.cpp
index 7d0c16932f..c1c8f34f9f 100644
--- a/src/oc/hoc.cpp
+++ b/src/oc/hoc.cpp
@@ -27,6 +27,7 @@
 
 #include <cfenv>
 #include <condition_variable>
+#include <filesystem>
 #include <iostream>
 #include <mutex>
 #include <thread>
@@ -168,9 +169,7 @@ static int c = '\n'; /* global for use by warning() */
 void set_intset() {
     hoc_intset++;
 }
-#endif
-#ifdef WIN32
-extern void hoc_win32_cleanup();
+extern void ivoc_win32_cleanup();
 #endif
 
 static int follow(int expect, int ifyes, int ifno); /* look ahead for >=, etc. */
@@ -960,16 +959,14 @@ void hoc_final_exit(void) {
     rl_deprep_terminal();
 #endif
     ivoc_cleanup();
-#ifdef WIN32
-    hoc_win32_cleanup();
-#else
-    std::string cmd{neuron_home};
-    cmd += "/lib/cleanup ";
-    cmd += std::to_string(hoc_pid());
-    if (system(cmd.c_str())) {  // fix warning: ignoring return value
-        return;
-    }
+#if defined(WIN32) && HAVE_IV
+    ivoc_win32_cleanup();
 #endif
+    auto tmp_dir = std::getenv("TEMP");
+    auto path = std::filesystem::path(tmp_dir ? std::string(tmp_dir) : "/tmp") /
+                fmt::format("oc{}.hl", hoc_pid());
+    std::error_code ec;
+    std::filesystem::remove(path, ec);
 }
 
 void hoc_quit(void) {
diff --git a/src/oc/mswinprt.cpp b/src/oc/mswinprt.cpp
index 3dfa805a3c..29ae6ec491 100644
--- a/src/oc/mswinprt.cpp
+++ b/src/oc/mswinprt.cpp
@@ -121,19 +121,6 @@ char* hoc_back2forward(char* s) {
 void ivoc_win32_cleanup();
 #endif
 
-void hoc_win32_cleanup() {
-    char buf[256];
-    char* path;
-#if HAVE_IV
-    ivoc_win32_cleanup();
-#endif
-    path = getenv("TEMP");
-    if (path) {
-        Sprintf(buf, "%s/oc%d.hl", path, getpid());
-        unlink(buf);
-        //      DebugMessage("unlinked %s\n", buf);
-    }
-}
 
 void hoc_win_exec(void) {
     int i;