The term "whitewash" can have different meanings depending on the context. In the context of painting and construction, particularly in Australia and other English-speaking countries, whitewash refers to:
Whitewash is a type of inexpensive paint made from slaked lime (calcium hydroxide) and water, often with added salt or other ingredients for durability. It has been used historically to coat walls, fences, barns, and other surfaces, especially in rural or agricultural settings.
In a figurative or metaphorical sense, "whitewash" means to cover up or gloss over faults, crimes, or unpleasant facts, often to make something appear better than it really is.
Let me know if you need details on how to apply whitewash or its suitability for Australian conditions.