YOU SAID:

i soiled myself awile ago

INTO JAPANESE

私は前に自分自身を汚しました

BACK INTO ENGLISH

i have soiled myself before

INTO JAPANESE

私は前に自分を汚した

BACK INTO ENGLISH

i dirty myself before

INTO JAPANESE

前に自分を汚した

BACK INTO ENGLISH

I polluted myself before

INTO JAPANESE

前に自分を汚した

BACK INTO ENGLISH

I polluted myself before