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Alexa shows some info about sites on the "Detail Page"... I believe the original post wanted to remove his contact info from these pages. Alexa has a form, listed at the bottom of all detail pages for this purpose. Response is slow though...
Alexa crawls sites... this is a different issue. Alexa does obey robots.txt, but because Alexa crawls aggressively and frequently, changes to your robots.txt files are not noticed right away. You wouldn't want the crawler to check the robots.txt file each and every time it crawled a page on your site... so it picks it up periodically. If you ever have a problem with the crawl, email@example.com usually gets a same day response.
Alexa shows Google results. Changes to Alexa's site info or Alexa's crawl won't affect the search results. Search is separate from Detail Pages and from the crawl.