Potentially cancerous waste fell off the back of a van driving through a residential street near a school on Thursday evening, but four days later it was still cleared up, according to an angry resident. Leah Rollins, a medical secretary from Shap Crescent, Carshalton , said she repeatedly complained after her road was strewn with asbestos – a fibrous rock widely used for household insulation until it was declared too dangerous in 1999 – on Thursday evening .