The windows are cleaned regularly by Cotswold Cleaning with a reach and wash system which uses de-ionised pure water.

However they do also clean the window ledges which means that some dirt and bird droppings might be washed off and onto cars below.

If this is causing you an issue it would be sensible to move your car on the window cleaning days.

The windows are cleaned every 2 months - July, September, November, January, March, May and on the second Thursday of those months.