I have a stain in my kitchen under my sink and by the dishwasher. I checked down the side of the dishwasher and its dry as well as under the sink. Could there be leaking under the floor when those areas are dry? It doesn't feel wet or moist to the touch. It actually seems oily or something of the like. I have no idea what it is but if its a big deal I wanna nip it in the bud. Thanks!