Gentlmen: From time imemorial, most Adobe homes / buildings were plastered inside and out after construction. It was only after years of neglect that they apeared as the one that we see in the westen movies. The floors were also generaly made of fired adobe bricks, nice and clean.
I repeat, check this one out,it is adobe from start to finish. --> www.haciendadelossantos.com
As for plain dirt floors, sheesh, after walking in plain dirt or mud streets etc., in those long skirts, a well swept clean dirt floor would be a luxury - sides remember soap and bathing was just starting to become acceptable back East, not on the Frontier, Most guys & Gals were a bit - errrr - rank, by our present standards.
Speaking from personal experience -- sigh. after a few weeks on the trail, I became a bit indistinguishable from my mule, along with my own personal additives, no wonder the lonely ranch gals showed no further interest after the first sniff or two..
Don Jose de La Mancha <--- the smelly one !