diff --git a/Development-Testing.md b/Development-Testing.md
index 119c6d3..c6e219b 100644
--- a/Development-Testing.md
+++ b/Development-Testing.md
@@ -19,6 +19,14 @@ dnf install python3-pytest python-tox python-typeguard python-flake8
 
 Run in main source directory
 
+### Directory Cleanup (optional)
+
+Note: will remove everything untracked, even ignored
+
+```bash
+git clean -fdx
+```
+
 ### Syntax check
 
 ```bash