what you doing, when bad robots ignore robots.txt, I using of course .htaccess, but still I have a lot of bots, do you have a some big list with bad robots
You can ban all identified bad robots from getting into your site by inserting few lines at .ht access You can ban such bad bots by two ways 1. by banning all accesses from a particular site 2. Banning all accesses that use a specific id to access the server.