These sort of re-targeting ads may backfire and annoy users.
How it works: https://support.google.com/adwords/answer/2454000?hl=en
Why it can backfire: http://www.technologyreview.com/news/512921/web-ads-that-know-too-much/
How to stop re-targeting: https://www.billhartzer.com/pages/how-stop-retargeting-advertisers/
Clearing your browser cache and your cookies is one way to stop re-targeting. But, keep in mind that you’ll need to do this over and over again, or on a regular basis.I myself use the browser in sandboxy and regularly cleanse the sandbox and with CCleaner.
polonus