I have found a way that my daughter can help with the general declutter that we seem to have going on. Felt tips! We came up with a system where she tried out each of the felt tips in her pencil case and then chucked them into one of two piles, depending on whether they had run out of ink or not. This sounds dull but she seemed pleased with the task AND it allowed me to get on with checking my emails.
Afterwards, we had a most satisfying throw out of all the pens that don’t work any more.