Icons problem

hi to all...

iam remastering knoppix for live cd and i have little problem. i wanna but i cant remove Trash and device icons from my desktop. i tryed remove all in /etc/skel/Desktop, comment some lines in /etc/skel/.kde/share/conf etc.
also i tryed delete those icons on desktop after booting knoopix and then save my configurations and moved to /cdrom/KNOOPIX and nothing. what ever i do those icons shows on my desktop. how can i remove them?...is it possible? window manager is KDE.

thnx a lot

d.