It was quite easy. Simon said just shred a plastic bag, put it in the litter tray and wait. It took a while and I had to put the litter tray outside instead of the usual one, but she did it and I just poured it into a bottle. Mind you in my haste as I only had 30 mins to get to the vets I nearly poured it into the bottle with Mowgli's steroids in. That would have been a costly mistake