My 3 brothers did - my dad would pour Detol in after each of them, I'd then have to get into cold (I wasn't allowed any more hot water) urine and Carol smelling water - I hated bath times.
Me. " Do you need a wee?"
Grandson *exasperatied* "No Nana"
*grandson places big toe left foot in the bath and does the 'I'm going to pee myself' dance.