Since November 2020, a decision by the Mobility and Transport Institute (IMT) has been in force, published in Diário da República, which states that a dirty car that prevents proper inspection by the responsible examiners may fail.

"Whenever the cleaning conditions affect the observations during the inspection, the vehicle must be rejected and the inspector must describe in the inspection form the failure to carry out the tests and verifications corresponding to the inspection because there are no clean conditions".

In addition, it should be noted that "lack of cleanliness or conservation of elements inside or outside" is considered a type 2 deficiency, which causes the failure of a vehicle.