How do i delete all duplicates and singlise a table

I currently have the following command which i use to to delete duplicates i.e.

delete * from [dbo].[commerce_manufacturer_staging]
where exists (
select *
from [dbo].commerce_manufacturer_staging as a
where a.[Name] = [dbo].commerce_manufacturer_staging.[Name]
and a.[TypeId] = [dbo].commerce_manufacturer_staging.[TypeId]
and a.[id] < [dbo].commerce_manufacturer_staging.[id]
)

Select allOpen in new window

However this take 20-30mins to run....

However If i run the following command

SELECT [Name],typeid, count([Name]) FROM 
commerce_manufacturer_staging 
GROUP BY [Name],typeid 
having count([Name]) > 1

Select allOpen in new window

This runs a lot quicker, however i cant work out how to delete the duplicates and only have one  instance of name and type per table. Can anyone tell me how i can use this a lot more efficently than what i have done intially?

Thanks
Webbo