YOU SAID:

I washed someone else's pants!

INTO JAPANESE

誰かのズボンを洗った。

BACK INTO ENGLISH

I washed my pants for someone.

INTO JAPANESE

誰かのため私のズボンを洗った。

BACK INTO ENGLISH

For someone washed in my pants.

INTO JAPANESE

誰かのため私のズボンを洗った。

BACK INTO ENGLISH

For someone washed in my pants.