Each Idea Page has its own Trash, located in the Sidebar. The Trash contains everything that you, or any member of your Project Team has deleted from that Page:

In the example shown above, the Trash for this page includes several documents and a Sticky Note. The Trash works on a Wiki model: any team member can delete any item from a shared Page, and any team member can restore any item from the Trash (i.e. put it back on the Page).

And if there's something in the Trash that you no longer expect to restore, you can remove it permanently by selecting them and press the Remove button. (Note: since Kerika works on a peer-to-peer mode, removing somthing from the Trash only removes it from your computer – your team mates will still have copies of it in their local Trash.)