When adding in the products via quick add, your recently added products will appear on the right hand side.
Simply select the cog icon and choose the delete option, you will be prompted with a warning to confirm all associated data will be deleted and removed.
If you are on the Product overview page, in either the Grid or Row view the process is still the same, select the cog icon and choose the delete option, you will be prompted with a warning to confirm all associated data will be deleted and removed.
Once a product has been deleted this can not be un-done