Vandals snapped off windscreen wipers on two vehicles parked in separate streets in Wirksworth.
A Ford Grosvenor parked in Willowbath Lane and a Peugeot 206 in Ian Avenue were targeted by offenders.
The two incidents happened between 3.45pm on Friday, December 6, and 8.45am on Saturday, December 7.
Officers are increasing patrols in the area and are appealing for witnesses or anyone with information to call them.
Police can be contacted on 101.
Alternatively, people can call Crimestoppers, anonymously, on 0800 555 111.