Washing up liquid is what we use in the clinic to remove oil. It s really really important that the cat does not ingest any of the oil. It can take repeated washings and in between our patients would wear a buster collar to prevent licking. Engine oil can do really nasty things to the cats stomach lining.
I bet it does, quiet confident he didn't lick it. Thankfully there isn't a huge amount.
It is done now, I'm now officially parnoid there's Fairy still on his fur and he'll get ill from that. Especially as he wasn't licking himself and now he is (whilst I was washing the Fairy out he licked my hand - wasn't expecting that!!!)