diff --git a/tox.ini b/tox.ini
index 377be25..d2edf9d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,10 @@ usedevelop = True
 install_command = pip install -U {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = ostestr --regex '{posargs}'
+commands = find . -type f -name "*.py[c|o]" -delete
+           find . -type d -name "__pycache__" -delete
+           ostestr --regex '{posargs}'
+whitelist_externals = find
 
 [tox:jenkins]
 sitepackages = True