Today I deleted I don't know how many accounts, but noticed that there was one that kept appearing with the same IP. In all cases I did a clean and brutal destroy of the account (Bloody mess actually, account parts everywhere). But then I thought, if there is a way to protect the site (Ban the account/IP) when destroying it so it does not appear for a long time.
There are days that there is 0% spam. Others is like we are in war with other stack exchange sites. So for this cases, how can we deal with spam related incidents in a way that the IP can not be used for several days (Instead of getting used 30 seconds later with another account and with another spam).