Westfield Mount Druitt Car Park Shade Cloths Changing Color!

At Mount Druitt Westfield ton the northern end, there are  huge shade cloths covering the back car park. Great for  shoppers in the heat and for the rain. The only thing that concerns myself is that how often do they either clean them or replace them with a new one. Dirt is appearing on the shade cloths (and I know they have been there for a few years).   

M health issue for the community as the dirt from the shade cloths can drop onto the shoppers and  affect their health and I wonder how often the Westfield Mount Druitt Health and Safety and Blacktown City Council Inspectors  have been monitoring it and reviewing it?

The other aspect is when you look up into the shade cloths it is not impressive.