How can i deactivate the vm2 Styling ?

I want to do some tests with a separate theme of vm2. Therefore, i need to deactivate all the functions for the Virtuemart 2 Core. Can you show me a way to do this without deactivatin the styles for the modules like car on the left or VM Products?

I guess that i have to do some changes in the template.css.css, index.php and style?.php and maybe i have to delete all existing overrides. But i don't know the exact points to do that.

You can select DEFAULT theme in VirtueMart configuration to reset all VM stylings to default.

Don't understand this exactly. These are the settings i already have done. How about index.php (load of ...vm...css). You think this is really all that you explained?

Edit:

I found the "rest": template_css.css

So i erased all these lines and now the remove process seems to be complete.

I checked this out now... erased the vm parameters in index.php of hot_commerce and the load of the vm-css-file. Then i erased all the overrides. But there is still the styling of hot-commerce when looking at the buttons e.g. "register and checkout" or "checkout as guest". firebug points me to:

But a cannot see where it comes from. It shows only h--p://.../de/my-account/rechnungsadresse.html

it's generated css form PHP code, check template_css.php

Ok. I will try this. Little bit confused now. I try to write down the steps i need for this. Is it important to erase everything in the index.php concerning Virtuemart? E.G. Tabs vm paramters from the template and the load of the vm css styles file?