We've never done the soap thing. My husband heard that it was considered child abuse.
My son (age 9) was easy. He has never repeated a "bad" word (and he's heard most of them, saw the "F" word on the bathroom wall in elementary school ) At around age 2 he asked me what the "bad words" were. Then explained he didn't want to say them, just needed to know what they were. He the child that was making good sentences by 18 months.
My daughter (6) has repeated quite a few. If she comes up with a new one we first explain that it's not acceptable and if she repeats it again, she wi