Another quick idea.
A CHILD AND HIS PARENT ARE TALKING.
Parent
I can't believe you said that in front of your Nan! I should wash yoUr mouth out with soap! (GRABS A BAR OF SOAP)
Child
No, Mum. I'm sorry.
Parent
(GOES TO PUT SOAP IN MOUTH) This will teach you.
(SHE IS INTERUPTED BY A MAN)
Man
What you doing?
Parent
I was just teaching my child that he can't swear when he wants to. It's called tough love. I am allowed to do that aren't I?!
Man
Yes, but I have a solution. (TURNS TO CAMERA) Sick of your unruly child constantly undermining you? Tired of using all that soap? Well here at 'soap solutions' we have a product that will end all that.
Parent
Really?
Man
Yes, for just a small fee of £84, you can purchase this, 'Bastard Bleach', the product that kills 99% of all bastardness! A dose of this and it will tell them little bastards not to utter even a 'f**k' or a 'shit.' This literally will save your life!
(HANDS OVER LIQUID TO PARENT AND CHILD, THEY SMILE AND THE WORDS 'BASTARD BLEACH' ARE SUNG AS THEY SMILE BACK AT SCREEN.