Do I need to wash my car for NCT?

Excuse me, I have a question regarding the National Car Test, or NCT. As someone who's preparing their vehicle for this examination, I'm wondering if there's a specific requirement to wash my car beforehand. Does the NCT involve any visual inspections that would necessitate a clean exterior? Is there a potential for dirt or debris to hinder the testing process or affect the outcome of the examination? I'd appreciate any clarity on this matter as I want to ensure my car is in the best possible condition for the NCT.