Maintaining cleanliness and not having direct contact with contaminated water is the main prevention SEE MORE...
The black crust which tends to be thick will not disappear if you just rub it with a sponge. SEE MORE...
For those of you who don't have citrus. SEE MORE...
Citrus is sometimes hard to find. SEE MORE...
Even though you have rubbed as hard as you can and for a long time, the ink stains are sometimes still clearly visible. So you need the right way to deal with it. SEE MORE...