During unloading, if a package is found to have leaked and contaminated the vehicle with corrosive Class 8 residue, who is responsible for ensuring the vehicle is cleaned?

1. The unloader and carrier share responsibility for ensuring the vehicle is cleaned and decontaminated before it is reloaded
2. Exclusively the driver, who must clean the vehicle at the roadside
3. The manufacturer of the corrosive substance
4. The driver's insurance company