Finding a mud bath room and getting hit in the face with a glob of mud can be confusing for a new player, if they're not aware of the wipe face command. And even for a long time player it's easy to miss the room message and assume you were blinded by a light trap. The effect could result in a recurring "Your eyes are covered in mud!" message to make it more apparent. Or you could make it so the PC automatically wipes the mud off, or make the mud wear off after a number of turns. Less confusion for new and experienced players alike. :)