How to make good rice?

After washing rice in water,
add a few drops of lemon juice, (or a few drops of oil),
cooked rice will turn out good and fragrant.

How to remove the wax from an apple?

If you often eat apples with their skin, then you would need to remove the wax first before eating ....
(a) place the apple into hot water, the apple's wax will vanish.
(b) Apply toothpaste on the apple to clean out the wax.

Tomato Paste clean rusted metal

Put the Tomato Paste on the rusted metal surface
Clean the surface with cloth!

由於金屬生鏽是鐵氧化的現象，而番茄醬內含有鐵離子，

因此就可運用其化學氧化還原的原理，讓鐵銹清除掉了。
As the metal rust is the iron oxidation phenomenon, and tomato sauce containing iron ions,

So you can use the principle of chemical oxidation and reduction, so the rust was removed.