about packages drifting in experimental

Dear QA Team,

Here are some packages which are only in this Debian release and
present for more than 10 years without much maintenance since years:

https://tracker.debian.org/pkg/dtc
https://tracker.debian.org/pkg/libvirt-tck
https://tracker.debian.org/pkg/sump-logicanalyzer
https://tracker.debian.org/pkg/tinysvm
https://tracker.debian.org/pkg/poti
https://tracker.debian.org/pkg/libtaverna2-server-java

Is there any clean-up process? Or anything useful to do?

Regards,
Patrice