Q: Removing content/songs from itouch

Does anyone know how to get purchased songs off of an itouch? My 10 year old son used my password and downloaded songs with explicit language to his itouch and now not only is it on his but it is also on my 7 year old daughter's i touch. My lap top is busted and that is where i had itunes downloaded, I only have computer access at work and there are definately firewalls preventing me from downloading itune there. I did contact itunes support, do you know if they can help me? My husband has an Iphone, not sure if that would work either. the kids have itouch 5th generation.