This is another behavioral approach:
When I was caring for several igs at a time (rescue effort) I avoided the pooping problems by using a trick. Every morning I would put each one
one at a time
in the bathtub. 3 1/2inchof water at the deep end, at 88F. Use a thermometer. I always used a thermometer so the igs never had a different experience in there and always knew what to expect. I left them in there up to 1/2 hour. 95% of the time they pooped. Actually probably 100% with the igs who weren't new at his kind of handling.
Some of the igs began to strain at pushing out their defecation as soon as they saw the tub, so I had to be quick getting those guys into the tub. Others languished in the water before pooping. I think those were the ones who really liked being in the water.
Get an aquarium net to scoop up he poop and urates, and put hem in the toilet. Drain the tub, rinse it well, towel it and let it dry, then rinse with a 50% solution ofchlorinebleach and water.Let that dry. At this point your tub is disinfected. Then take your next shower, any esidue will easily wash away. I was not as thorough asthis, and I never got any disease from a non-disinfected tub.
My keyboard isdoing it's nasty thing again.
Giving an ig it's first experience in a tub frightens them. They scramble rapidly, trying to claw their way up the sides of he tub. They gradually get used to the experience, and then tubbing causes no stress at all. But at first, you have to use personal restraint on your natural urge to rescue him from the tub. This is harmless to even those who are scared beginners.
It helps them if you put a lot of colorful stickers all over the inside of the tub. LOTS of them on the sides and bottom. IMO igs can't focus on the walls of an unadorned tub.
The beginners don't always poop in the tub. But after a while, most of them do it 100% of the time.
Do this when he is warmed up in the morning, and before he eats. If he poops before he is warmed up, then tub him before he warms up or while he is still asleep.
One more thing. Now that his poop smell is everywhere, he smells pooping zones everywhere. So I advise you to drag his habitat outside, strip out all of he absorbent materials such as cloth, carpet, etc. Don't beathe any of the dust. mix of TSP and hot water. Use a whisk broom to scrub the solution onto all the surfaces. Then use a hose nozzle, whisk,and a large brass 'toothbrush", and Scotch Brite pads to scrub the entire interior. Even get all the way into the corners. When it's clean, let it dry thoroughly. Then make a 50% solution of chlorine bleach and water. Spray or brush the solution onto every surface until the bleach runs off the surfaces, interior and exterior. Let it dry, then rinse well with water, then let it dry until you can smell no more traces of chlorine. Then it will be disinfected, ready for your iggy.
I learned the disinfection routine on a medical website, but alas I did not save the citation.
The alternative is to build s new habitat with new materials.