洁净电水壶

家中有一个Tefal的电水壶，用了多年，里面积累了一些锈迹。
曾经买了特用的清洁剂给女佣清洗，却不见效果。

那天在网站读到可以用柠檬或醋：
Cut a lemon or lime into 4 pieces.
Fill the kettle with water up to the maximum level,
squeeze and put the lemon slices inside,
and boil the water.
Let the water cool down for 1 hour and boil the water again.
The kettle will be as clean as new.

De-scaling a kettle
Pour white vinegar to cover the base and leave for 1 hour. Rinse with cold water. Fill the kettle with cold water, bring to boil, and throw away the water.

刚好家中有柠檬，就试用方法一。
果然有效，钢铁除锈迹清除，不费吹灰之力。
只是，塑料的接触面还是会有锈迹……