With his (bare) hands ...
Bless him, he is trying to be grown up and to help. he is nearly 17, autistic, LDs, and he frequently blocks the loo by using a whole roll at each poo! I regularly have to unblock it ..yuk.
But I am away looking after his sister who has just had an op and complications, and he blocked the loo then though, rather than wait for Daddy he would do it himself. Not knowing any better he fished out the offending poo and all the loo roll... with his hands...
He was very proud and excitedly informed Daddy just before he was about to eat his dinner. Needless to say he was plonked in the shower first 
DH said he was careful to congratulate him , while scrubbing him!
Bless him he tries so hard to help. His autism has been a blessing the last couple of days, as he isn't worried sick about his sister. She went in for a simple tonsilectomy (she is 22 but a med student far from home and was scared so I went to be with her) and post op she had 9.. yes 9.. severe tonic clonic seizures and now needs a heap of investgations :( She has ADHD, and various other neuro oddities but this was a bit of a blinder for us :/
I am going to teach him how to use the plunger I think!!!!