Summarize this article:

The water does not need to be steaming hot, but it should be more than simply lukewarm.  A thorough, wet wash should be performed every few months or after a wide area of the floor has gotten muddy or notably dirty. Hot water is often considered one of the best ways to clean laminate flooring because, when done correctly, it will not leave streaks. It is also the least likely to damage the protective coating of the laminate, since water is the mildest cleanser possible.

Summary:
Fill a bucket with hot water.