Can i remove all my products and start new listing

Hello Jinkko, thanks for reaching out to the QuickBooks Community.  You can make all the products inactive, there is not the option to remove them completely, however. To do this go to the settings cog in the top right of QuickBooks> put a tick in the box to the left of name at the very top of all the products and then go to the batch actions dropdown and select make inactive. More details can be found here