Follow this link where CptLucky8 shows you how to clean the Nvidia drivers by very simple deletion of folders within the Driver archive and just editing three simple lines with a text editor.
You need to expand the text by clicking ‘NVIDIA SETTINGS’ the instructions are easy to overlook in his posting. Scroll to bottom and you will find out how to ‘Slim’ the drivers for yourself.
This is the method I use trim my drivers most of the time.