Abseilers were among workers who spent nearly three days retrieving more than a thousand tyres dumped off a road near Clevedon.
It is one of a spate of recent illegal dumping incidents suspected to be by commercial operators.
Strewn through native bush and down a ravine fringing Twilight Rd were 1285 tyres.
The road was closed during the clean-up which Auckland Council estimates will cost ratepayers $25,000.
In addition to the tyres, 3.8 tonnes of general inorganic waste was collected. Specialist manpower and equipment used included four abseilers and a 3000kg Palfinger crane truck.