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.
The female will return to the selected site to lay an egg each day, then return to the water to be with the male. Mallards lay between 8-12 eggs and muscovies lay between 12-18 eggs. The egg laying process lasts for an equal number of days (it takes 12 days to lay 12 eggs). Once egg laying is complete, she will leave the male (who will wait at the water for her) and she will begin incubation on the nest fulltime.