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You can't use a Flow step because that means you are tracking the lead! Cookies are about more than PreFill.
To disable cookies, first make sure you're running the latest Munchkin (http://munchkin.marketo.net/munchkin-beta.js).
Then give users a link to a page with the query param
in the URL.
Correction: though this feature is now officially documented -- previously, it was unofficially claimed but not implemented in reality -- it doesn't work without an additional hack, which I'll publish on my blog.