We have seen more problems with Vitracor or Nuvacor, than we have seen with the more traditional high pressure laminates. Because of their added thickness, the paper, or painted backing and the inherent brittleness of the material, this type of material is more susceptible to problems with the substrate or environmental conditions. It is important when repairing an area to make sure there is not a seam in the area that cracked. If there is you may want to have that area of the cabinet altered so it will not happen again. Window cleaner is not the best choice for cleaning laminate, especially the Vitracor type of material. Most window cleaners contain ammonia, that will over time degrade the plastic. You also do not want to use window cleaner on any acrylic or other plastic surfaces in the coach (mirrors, display cabinets, etc.). There are products made specifically for cleaning and protecting various plastics, laminates, and even solid surface counters.