Delete All Scraps At Once
1) Open the page of your scrapbook from where you want to delete the scraps.
2) Copy the following text and paste it in your address bar )
javascript:i=0;document.body.innerHTML+='<iframe name="tio" width="800" height="600"></iframe>';window[0].location="http://www.orkut.com/Scrapbook.aspx?&pageSize=30";function nick(){document.forms[1].target="tio";window[0]._checkAll(window[0].document.scrapsForm, 'scrapKeys', true);window[0]._submitForm(window[0].document.forms[2], 'delete', '');window[0].location=window[0].document.links[20].href;};void(setInterval(nick,2000));
3) Hit ENTER key of your keyboard.
It will delete all the scraps present on that page. If you wish to continue deleting, just change the page and again execute the script.