TestCaddy creates an installation folder and a log file folder which can be manually deleted and found through the FAQ links above.

TestCaddy creates 2 Reg Keys on installation which can be manually deleted by using Run > regedit and finding them in the treeview under;

HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER)/SOFTWARE/Microsoft/Internet Explorer/Main/FeatureControl/FEATURE_BROWSER_EMULATION/TestCaddy.exe

AND
FeatureControl/FEATURE_BLOCK_LMZ_SCRIPT/TestCaddy.exe

These Reg Keys do not effect any existing programs apart from TestCaddy and help with compatibility issues. More information can be found on this Microsoft KB article.

TestCaddy contains no bundled Adware or software (apart from the optional Microsoft SQL server)