How to remove old result from teamcity web UI

Hi,

Since I have run many times, and it generated a lot of result entry in teamcity web UI, do you know how to remove them? Since I haven't found remove button from the web.

Still I have a question about artifacts, I found teamcity will automatically generate a folder (the name is an auto increment number) to store the artifacts, can I get the folder name in my ant scripts. Such as by a variable ${artifacts.folder.name}?

Thanks,
Yolanda