My coolant bottle for the radiator is covered with orange rust on the inside. All the pictures I see of other coupes have nice white transparent ones. Can you clean them or do you have to buy a new one and if so where is the cheapest place to get one?
You need a bottle of red wine, a bag of rice and some water with a dash of bleach.
Remove the coolant bottle, blank off all the pipes with tape except the coolant bottle cap, pour in a cup of rice or maybe a little more then give it a real good shake, add some more rice and shake it up again then add the water/bleach and give lots more shaking.
Make sure you rinse all the rice out then sit back and admire your lovely clean coolant bottle with a glass of red wine.