prstorm is a black hat spammer's tool used to spam the referrer logs of websites in an effort to somehow create backlinks to their own sites for SEO purposes, if a host publishes the referrer logs (I don't know many that do). It hammers servers sometimes 50 times a minute.
Now I don't know what you need to clean from your urls, but I am not likely to help you if you plan on using prstorm, and I am not sure anyone else on this forum would either.