إذا غسل الثوب النجس بالخل فزالت النجاسة يحكم بطهارة المحل.
If a soiled garment is washed with vinegar and the physical impurity disappears, the place is treated as clean.
The case concerns removal of actual impurity from an object. It must be distinguished from removing ritual impurity (hadath) through the prescribed forms of ablution or bathing, for which the law specifies its means.
The example illustrates that two rulings described with the word “purification” may operate through different legal causes. A liquid effective in one setting is not therefore sufficient for every other kind of purification.