DS is 11 and takes baths and uses a jug to rinse his hair. It's still the same jug from when he was a baby. It lasted well, but it's finally starting to fall apart.
I told DH I was going to buy a new jug, but he insists that jugs are only for babies and DS should now do without. DS disagrees strongly.
As far as I can find, even for adults, rinsing hair with a cup or jug is a reasonably normal thing to do. On the other hand, the only shampoo-rinsing jugs I can find in shops are in the section for baby stuff.
YABU = Jugs/cups are for babies. DS needs to rinse his hair another way.
YANBU = Rinsing hair with a cup/jug is fine.