remove uploaded images

i designed a ss site for a client and uploaded a number of images, many of which i didn't end up using. i would like to remove those images so i can turn the site over to my client without including the original work product which is not featured on the site and belongs to me. is it true there is no way to do this? really? (your competitors include this feature). is there a plan to include this feature. when? as is, this is a huge dealbreaker for me and future client site recommendations.