The thing to avoid is allowing water to stand on the floor for a long period of time. Water will soak into the seams of the boards and cause them to swell and delaminate. Damp mopping is fine, just don't soak the floor. Good cleaners to use are ammonia or vinegar in hot water. Home improvement stores sell special laminate cleaners but they are made of ammonia and water. No matter what two hundred people tell you, do not use Murphy's oil soap or any kind of oil, wax, or soap. They may look good at first but leave residue that will eventually make the floor very dull and filmy. Many people have trouble eliminating streaks when cleaning Pergo. The only way to get rid of all the streaks is to dry the floor after cleaning. Using very hot water also will aid in streak control.
I damp mop my floors every week because we have animals in the house the they track in everything. I use Murphy Oil Soap and a damp mop, not wet. Wring it out real good and then just mop it like you would any floor. I've been doing this for over 3 years and the floor looks like new....except where someone dragged a chair on it. Oh well, that's life!
A cup of vinegar in a gallon of water...:)