Does renal artery carry unclean blood?
Yes, it carrier unclean blood to the kidney for purification
The renal artery brings blood to the kidney for filtration, the renal vein carries away filtered blood from the kidney. Veins carry deoxygenated blood whereas arteries carry oxygenated blood. Arteries appear much thicker and firmer than veins, veins have a blueish tinge even in cadavers whereas arteries are a deep red in the living and white in cadavers.