aja8888
Moderator Emeritus
simple solution: place a towel or mat under the humidifier, stop further damage and hide current spots! That is what I do.
Of course, since the damage is already done, carpet replacement may be next, if your DW can't "unsee" it.
A few spots here and there give the place the "lived in" look, commonly known as "character". (hey, I'm getting little brown spots on me!)