Yup, spit works well - as long as you haven't been eating anything lately.
It's one of the things art conservators use to clean sensitive items because it has natural enzymes that break down dirt. So mamas around the world had it right for centuries when they used it to clean smudges on kids
It has fallen out of use for now because of CV19 risk however. But for hooking up hoses water w/o soap works too.
dj