well for one stop using the murphy's...... go to this link for solutions to your laminate flooring for cleaning.... http://www.stretcher.com/stories/03/03dec08b.cfm
and direct from pergo here is there answer a bit vague but you get the jist.... 1. How do I clean my Pergo floor?
The surface layer of Pergo flooring is hard and compact, so dirt and dust do not adhere to it easily. An occasional damp mopping, a quick sweeping or light vacuuming with the hard floor attachments are usually all it takes to keep your Pergo floor clean. Do not use soaps or detergents because they may leave a film, dulling the floor. Difficult spots like nail polish, markers, tar and cigarette burns can be removed with Pergo's Laminate and Hard Surface cleaner. Pergo floors must never be waxed, polished, sanded or refinished.