<p>I thought I'd recently seen the auto-delete criteria posted here, but I can't find it now...</p>

<p>I fairly frequently downvote closed, downvoted questions just to be sure they get auto-deleted.  Since I can never remember exactly what the rules are for the auto-deletion, if something is -1 with no activity, I'll often make it -2 just to be sure.</p>

<p>According to the <a href="http://meta.stackexchange.com/questions/5221/how-does-deleting-work-what-can-cause-a-post-to-be-deleted-and-what-does-that">FAQ post on Meta.SO about deletion,</a> my habit of adding another -1 just to be sure a closed question gets deleted isn't necessary:</p>

<ul>
<li><strong>The system</strong> will automatically delete <a href="http://meta.stackexchange.com/questions/78048/auto-deleting-old-unanswered-zero-score-questions-after-a-year/92006#92006">unlocked, unanswered questions that have negative score after 30 days</a>.</li>
<li><strong>The system</strong> will automatically delete <a href="http://meta.stackexchange.com/questions/78048/auto-deleting-old-unanswered-zero-score-questions-after-a-year/92006#92006">unlocked, unanswered questions with score of zero (or one if the owner is deleted), fewer than 1.5 views per day on average, and fewer than two comments after a 365 days</a>.</li>
<li><strong>The system</strong> will automatically delete any question (and its answers) or answer with a score less than 0 when its owner's account is deleted.</li>
<li><strong>The system</strong> will automatically delete questions migrated to other sites <a href="http://meta.stackexchange.com/questions/79051/why-was-my-question-moved-and-why-was-it-then-deleted-off-of-the-original-site/79082#79082">after 30 days</a>.</li>
</ul>