Answer #1: It is always a mistake to pour
grease down a drain. Detergents will emulsify it but only if you are
getting rid of a small amount such as remains in a pan after most of it has
been poured into the trash can. -- essie2000 Comment
Answer #2:If you get a clogged drain use Drano Kitchen Crystals. These are only sold in the US, if you live in a place where they are not available you can buy an equivalent. The active ingredient is Caustic Soda or if you want the proper chemical name : Sodium Hydroxide.
Grease in drains is a major problem worldwide and costs hunreds of millions of dollars in plumbing bills. Plumbers love you for putting grease down drains it as it a major source of their income. -- qznaz Comment