As part of a targeted approach to tackle this continuing issue and better protect public safety, an increase in enforcement activity was expected, Mr Wilde said.
Fines of up to $20,000 could be imposed on a person convicted of breaching a bylaw under the Local Government Act.
The Public Safety and Nuisance Bylaw was in place to make sure public spaces feel safe and are convenient for people to use and enjoy without being disturbed or experiencing offensive behaviour, he said.
What to do if you encounter a window washer:
• Make it clear that you don't want your window washed - shake your head or say no;
• Roll up your car windows and don't engage in conversation;
• If they continue to wash your car and demand payment in an intimidating way, make a complaint to the council by phoning (09) 301 0101;
• Take a photo on your phone of the offender if you feel unsafe and send to the council or police; and
• In cases of criminal activity such as assault or wilful damage, call 111.