Removing Gallery images

Hi I have uploaded / imported all my products to woocommerce via WP Importer..

Successfully done over 800 items..

But each product now has 800 images in their image galleries

So each of the 800 products now has 800 images in the image gallery..

Manually deleted these individually is taking a long time..

Can anyone explained what happened here…. and how I can delete the image galleries of each product quickly and easily..

Thanks in advance…