Where do I put the detergent? It has a hole in the middle of the shaft that sits in the middle if the tub but that says to put fabric conditioner in there which I presume is another name for fabric softener. There is also a groove with holes in it on the top lip of the tub but it doesn't say what this is for so I don't wana stick anything in there just in case without knowing. I just want to know where to put the standard washing liquid not fabric softener???