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Are you having trouble getting the Cleanup Achievement on Prototype on xbox 360? The best place to get this achievement is to wait for the Street Sweeper combat event. It will be found half-way between Times Square and Little Italy on the mini-map. The Street Sweeper event requires you to kill as many infected as possible using only Whipfist Attacks so just keep redoing the event until the achievement unlocks.
An easy method is to find the event where you use the nuke tank. Rather than actually trying to perform in the event, just steal the tank, cancel out of the event screen, and drive around the city. You can kill a hundred or so infected per shot, and meaning around 2000 (including varients) per tank steal.
The tank responds if you park your old one far enough away and wait a minute or two.