My dad says his family used the Sears and Roebuck catalog when he was a kid. My grandparents didn't have indoor plumbing until the late 40's, but the good news was they had converted over from catalogs to TP around 1940.
Bless his heart, it’s not lye you use in outhouses - it’s lime. There was a sack of it in the girls’ outhouse on my great-grandparents’ farm, with a little beach shovel. You just always threw in a shovelful after you were done. I assume there was a sack in the boys’ outhouse too, but I never saw that one. With ten kids (Grandmaw was near the top) they had to have two outhouses, and the girls’ at least was a two-holer. In 1970 the relatives left on the farm put in septic and an electric well. I don’t miss the one-eyed owl a bit.