This mod patches all defs with the <filth> field, first it removes all existing tags then it adds tags so filth vanishes in 14-15 days and washes away with rain/snow. What does this mean? It means every type of filth in the game and every type of filth added by mods should vanish with rain/snow and disappear after 14-15 days (in vanilla this is typically between 35-50 days).
As a result with this mod rain/snow will now clean your map and any areas that are undercover, forgotten and not cleaned for a long time will eventually become clean on their own.
The following types of filth and more will now be washed away by rain/snow and vanish over time.
Note: In vanilla some filth types such as blood, corpse bile, dirt, firefoam and a few other things already vanish with rain/snow.
This mod shouldn't have any compatibility issues. Just make sure it is loaded near the end of your load order so it can overwrite any other mods as necessary.