Always dilute your fabric softner and DO NOT use the detergents that claim to have fabric softner in them.This was a serious problem which began when Rainbarral was introduced back in the 70's.What can happen is in the agitators center,the fab soft'r that wasn't diluted builds up and becomes real gummy looking like tar then as it loosens up,it creates a residue that gets deposited on your clothes.The same thing happens in the wall of the outer tubs in top loaders more than front loaders.But,as a whole, people just have no clue as to what goes on inside their washers and assume that the transmission is leaking oil and go and buy a whole new washer.Months later,the same thing happens and they finaly realise that their old model had nothing wrong with it.It's happened to customers I had at the retailers I worked for more so than not.All the customers I shared that info with came back and some brought their center filters from their Maytags full of lint and "tar"just to show me I was right and thank me for letting them save a bundle.I am not saying the problem you're having is the same but it sounds so familiar and I hope that is what's wrong.If that's what it is,either stop using the detergentw/softner in it or remove the stem in the agitator and soak it in hot water over night.Once it's clean,always dilute the fab soft'r when placing it in the dispenser AND,when the washload you're doing needs no soft'r,just put warm water in it.That helps to keep it clean.Good luck!