Vray introduced Vray Denoiser lately which is post rendering process using extra passes which is mostly you won't need it on composting and for production its taking too much space
this simple script will delete it for you.
Extra elements are defocusAmount, diffuseFilter,noiseLevel, refractionFilter,reflectionFilter,worldNormals ,worldPositions
just choose the folder/folders containing the render images it will auto search them and clean those extra unusable elements for you.
Warrning: use it on your own risk , and there is no undo for this at all so be carefull and plz send feedback.