The waist ties in a pair of CS95 trousers. It looks like string but if you open it out it goes to nearly two inches wide.
Just run it back and forth across yer ballon knot and you have a nice clean hoop!
I've done that a few times.... there's something quite inquisitively satisfying about rubbing your fingers around the peaks & troughs of one's bumhole.
Last time I got a lump of butt mud stuck to my index finger and i was stood over the pan for ages flicking my wrist (Ali G style) to get it off, needless to say when it did shift, it missed the bog and hit the floor.
That ment i had to lean over a get a new bog roll out the cupboard anyway.
During desperate moments, out in the middle of the cuds, I have been known to use a handy twig to remove the worst, simply wipe it sideways across the hoop and it get's the worst off until civilisation is reached....