An unknown substance - speculated to be acid - was thrown over three cars parked in a driveway in Barnston.
The cars were damaged at around 3.30am on Saturday, October 19 in Berners End off Chelmsford Road.
The property is near a bus stop, and the cars' owner recently put up a sign to dissuade drivers from parking in the road to avoid paying for parking at Stansted Airport.
He said: "The council has put a tiny notice on one of the road signs but only on one side.
"A neighbour from over the way asked if we would put a sign on our fence to say 'no airport parking, residents only'. We duly obliged and this reduced the number of people parking.
"About three months ago the sign was pulled down by someone who decided to they wanted to park there anyway. Then I put the sign back up.
"We have no disputes with anyone, so this is almost certainly as a result of having the sign on our fence, then the airport parker decided they would take revenge."
Anyone with information which could help police in their investigation should contact Essex Police on 101, quoting crime reference 42/159828/24.
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