UPVC windows are cleaned with water and vinegar mixed in a sprayer. Jupiterimages/BananaStock/Getty Images. Unplasticized polyvinyl choloride, or UPVC, is a rigid and chemically resistant plastic used often in window and door frames.
Clutch size: 35-50 eggs. In April or May, the female crocodile will build a nest of loose dirt in a mound by the water's edge and lay her eggs. She buries the eggs and fiercely guards her nest. When the eggs hatch in July or early August, the female helps carry her young to the water.
Many species of treefrogs lay their eggs on leaves that overhang pools. When the tadpoles hatch, the pollywogs slide down the leaf and slip into the water below. Other frogs, like the surinam toad; actually cares for its eggs on his back. There are dendrobates that lay their eggs in the water filled cups of bromeliads, others will hide them under damp leaf litter.