diff --git a/.github/workflows/cleanup.yml b/.github/workflows/cleanup.yml
index 339a5be688de..0a96f329ab53 100644
--- a/.github/workflows/cleanup.yml
+++ b/.github/workflows/cleanup.yml
@@ -2,7 +2,7 @@ name: Clean up abandoned files
 
 on:
   schedule:
-    - cron: '30 0 * * 1'
+    - cron: '0 2 * * 1'
   workflow_dispatch:
 jobs:
   update:
diff --git a/.github/workflows/update-tr.yml b/.github/workflows/update-tr.yml
index 2d0f00a47d19..d997f2372d69 100644
--- a/.github/workflows/update-tr.yml
+++ b/.github/workflows/update-tr.yml
@@ -1,6 +1,6 @@
 on:
   schedule:
-    - cron: '11 11 * * 1'
+    - cron: '0 1 * * 1'
   workflow_dispatch:
 name: Update TR report
 jobs:
diff --git a/tools/clean-abandoned-files.js b/tools/clean-abandoned-files.js
index 9221a8734452..6dae14b0ff0a 100644
--- a/tools/clean-abandoned-files.js
+++ b/tools/clean-abandoned-files.js
@@ -4,6 +4,7 @@ const ed = require("../ed/index.json");
 const tr = require("../tr/index.json");
 
 const subdirs = ["dfns", "css", "headings", "idl", "idlparsed", "links", "refs"];
+const idlnamesSubdirs = ["idlnames", "idlnamesparsed"];
 
 
 const removeExtension = f => {
@@ -21,7 +22,45 @@ function checkDir(path, index) {
   }
 }
 
+function checkIdlNames(path, index) {
+  // Build the list of IDL names from idlparsed extracts
+  const idlFiles = new Set(index.results.map(spec => spec.idlparsed).filter(s => !!s));
+  let idlNames = new Set();
+  for (const idlFile of idlFiles) {
+    const idlparsed = require("../" + path + "/" + idlFile);
+    if (!idlparsed || !idlparsed.idlparsed) {
+      continue;
+    }
+    if (idlparsed.idlparsed.idlNames) {
+      for (const name of Object.keys(idlparsed.idlparsed.idlNames)) {
+        idlNames.add(name);
+      }
+    }
+    if (idlparsed.idlparsed.idlExtendedNames) {
+      for (const name of Object.keys(idlparsed.idlparsed.idlExtendedNames)) {
+        idlNames.add(name);
+      }
+    }
+  }
+
+  // Parse subfolders that contain files named after IDL names
+  for (const subdir of idlnamesSubdirs) {
+    if (!fs.existsSync(path + "/" + subdir)) {
+      continue;
+    }
+    const filenames = fs.readdirSync(path + "/" + subdir);
+    for (const filename of filenames) {
+      const name = filename.match(/(.+)\.[^\.]+$/)[1];
+      if (!idlNames.has(name)) {
+        fs.unlinkSync(path + "/" + subdir + "/" + filename);
+      }
+    }
+  }
+}
+
 for (let dir of subdirs) {
   checkDir("ed/" + dir, ed);
   checkDir("tr/" + dir, tr);
 }
+checkIdlNames("ed", ed);
+checkIdlNames("tr", tr);