The personalized view is stored in the DDS so you might want to check out the DDS explorer (I Don't remember which stores you need to clear):
For EPiServer 7, I have blogged about how to clear the views here: http://world.episerver.com/Blogs/Linus-Ekstrom/Dates/2013/1/Resetting-your-EPiServer-views/ and also added this support natively for the next release.
Thanks! After clearing "DashboardStore" the layout is resetted.
Hi! I've made a template of dashboard gadgets in web.config for all users, but this doesn't affect the users that have previously logged in to the online center. So my question is if there is a way to clear these settings for all users so that everyone will get their gadgets according to my template?