Breaking down grease with 分解

Kanji Explanation: Separating and understanding with 解

Hinata dedicates the month of December to giving her home a complete cleaning.

ひなた:: 「お父さんがちまちま貯(た)めた新聞(しんぶん)…」; “The old newspapers Dad's been saving forever...”; 「これをぬるま湯(ゆ)につけてガラスを拭(ふ)くと油分(ゆぶん)を分解(ぶんかい)してピカピカになるんだ」; “Soak them in warm water and wipe the glass, and they cut through the grease and get it sparkling clean.”

Key Points

分解(ぶんかい) = “break down” into smaller parts
- Here, 油分(ゆぶん)を分解(ぶんかい)して means the oily residue gets broken down so it can be wiped away more easily.
- The translation uses “cut through the grease” because that sounds natural in English, but the Japanese image is specifically one of breaking the grease down.
What を is marking here
- 「油分(ゆぶん)を分解(ぶんかい)して」 makes 油分(ゆぶん) the thing being acted on, so it is the grease that gets broken down.
Sentence ending nuance: ピカピカになるんだ
- 「ピカピカになる」 means “become shiny”.
- The んだ ending gives an explanatory tone, like Hinata is sharing a useful cleaning trick she knows.