diff --git a/.gitea/workflows/deploy-socialize.yml b/.gitea/workflows/deploy-socialize.yml
index 8421a40..3c46658 100644
--- a/.gitea/workflows/deploy-socialize.yml
+++ b/.gitea/workflows/deploy-socialize.yml
@@ -10,6 +10,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - name: Check repository hygiene
+        run: ./scripts/check-repo-hygiene.sh
       - name: Install Docker CLI
         run: apt-get update && apt-get install -y docker.io
       - name: Login to Gitea container registry
diff --git a/.gitignore b/.gitignore
index 23dc7a3..20856a6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,6 +22,10 @@ Thumbs.db
 # .NET
 bin/
 obj/
+**/[Bb]in/
+**/[Oo]bj/
+**/[Bb]in[\\]*
+**/[Oo]bj[\\]*
 TestResults/
 
 # Node
diff --git a/scripts/check-repo-hygiene.sh b/scripts/check-repo-hygiene.sh
new file mode 100755
index 0000000..8022adf
--- /dev/null
+++ b/scripts/check-repo-hygiene.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env sh
+set -eu
+
+failed=0
+
+tracked_build_outputs="$(git ls-files | grep -E '(^|/)([Bb]in|[Oo]bj)(/|\\)' || true)"
+if [ -n "$tracked_build_outputs" ]; then
+  printf '%s\n' "Tracked build output paths found:" >&2
+  printf '%s\n' "$tracked_build_outputs" >&2
+  failed=1
+fi
+
+tracked_backslash_paths="$(git ls-files | grep '\\' || true)"
+if [ -n "$tracked_backslash_paths" ]; then
+  printf '%s\n' "Tracked paths containing literal backslashes found:" >&2
+  printf '%s\n' "$tracked_backslash_paths" >&2
+  failed=1
+fi
+
+if [ "$failed" -ne 0 ]; then
+  printf '%s\n' "Remove generated files from Git before building." >&2
+  exit 1
+fi
+
+printf '%s\n' "Repository hygiene check passed."