An example of white bricks yellowing returning worse than before after whitening treatment : r/lego
LEGO Ambulance 7890 NEW! Paramedic EMT Emergency Rescue Town City NISB! | eBay
Amazon.com: LEGO City 66175 Rescue Pack (Special Combo Pack of Sets 7944 Fire Hovercraft, 7890 Ambulance, 7236 Police Car and 7238 Fire Helicopter) : Toys & Games
Ambulance - LEGO set #7890-1 (Building Sets > City)