In this context the pussy and womb are different objects, pussy is part of the description and womb is related to impregnation. It appears that currently the personal baths should remove all cum from the body(except pussy) of slaves. Even without a bath, slaves may remove cum from parts of their bodies(except the womb) if they don't enjoy it or too much accumulates. Also, each day the amount of cum on their body is reduced by a very small amount.
There is no wiki for this mod and Aric prefers people find out through experience, but the mod scripts are text files and gdscript is fairly easy to read even with little experience in programming.
For tracking down the error, I recommend using the Debug mod ( https://itch.io/t/1137280/debugmod-v1 ) as it will usually provide error messages that identify what happened and where. Note that with the Debug mod the game may not crash from errors, but game data can be corrupted and the game will attempt to keep running anyways. If you play with the Debug mod, check for errors before saving.