Confused about fingering and cleaning

so guys, to keep it short I might be bottoming in a week or so and therefore I've started testing and playing a bit with my anus not to be fully unprepared. I'm completely new to this and so far I've tried fingering it a couple of times and with lube I've managed to fit 3/4 fingers. The main problem concerns cleaning... obviously a finger isn't gonna go as deep as a dick (his is like 17cm and hella thick), and yet I always find poop when I get in, and I don't mean some residue, I literally feel a full one there waiting for me. idk if I've been going too deep, but I doubt that. Also, I've found it not to be particulars solid and right after pooping I still found my fingertip to get dirty as if I put the very end of it in a Nutella bucket, and that for multiple times. articles I've read say poop should be stored high up where you don't reach, but this doesn't seem to be the case for me. what do I do? what might be the problem?

sometimes I've managed to kinda clean up enough, at least for fingering, and finally could enjoy it, but I doubt I could clean up as deep as a dick with just my finger. I don't wanna buy expensive equipment as I've read it's not really needed to keep it clean enough