Anza-Borrego State Park is also supposed to be "Pack it ALL out!" in addition to Whitney
My first backpacking trip was in Yosemite in 2010. Yosemite Rangers are darn near militant on packing out toilet paper when you pick up your permit. So on my first trip... I was initiated by Yosemite Rangers. I've actually seen very little TP in Yosemite, because the rangers do a great job on educating backpackers in this super high use area. I haven't been on the PCT/JMT in Yosemite... so I can't tell you what the TP is like there.
The PCTA is also attempting to educate people on packing out TP.
https://www.pcta.org/2017/thru-hiker...-trowel-49043/
Favorite natural wipes:
Old Man's Beard (the plant, not human hair...
) rehydrated in water. Like a soft sponge.
Corn Flower Leaves - I started feeling guilty pulling leaves, and don't use it any more.
Thimbleberry leaves... but don't use anymore. Feel guilty.
The right sized rock.
Followed up by soap and water (and hand sanitizer, for good measure).
Not a fan of snow, pinecones and sticks...
I've changed a lot of diapers and also washed cloth diapers. People sometimes get poo on their hands.
I'm out 30-ish nights a year. I have never gotten giardia or other poo borne illnesses. But I do thoroughly wash my hands.