The parking meter revolt rolls on? Chicago getting fed up

A friend has a sprayer mounted on his truck and can spray those pesky speed cameras with oily water.
This degrades the photos till they can not read till someone goes out and cleans the glass in front of the lens.

Traffic Camera

*A man was driving when a traffic camera flashed. He thought his picture was
taken for exceeding the speed limit, even though he knew he was not
speeding. Just to be sure, he went around the block and passed the same
spot, driving even more slowly, but again the camera flashed. He thought
this was quite funny, so he slowed down even further as he drove past the
area, but the traffic camera flashed yet again. He tried a fourth time with
the same result. The fifth time he was laughing when the camera flashed as
he rolled past at a snail's pace.**

Two weeks later, he got five traffic fine letters in the mail for driving
without a seat belt.