I was shocked when I removed the fabric softener dispenser of my one year old AWN-542 SQ T/L washer to find an enormous amount of gunk build-up inside the agitator. It took three tea kettles of boiling water to get rid of it all, and then I ran a hot water wash with bleach to clean the machine. I also took apart the dispenser and washed that with hot water in the kitchen sink...I can't believe how little time it took for that to build up, I can only imagine how people let it go for years how much gunk there must be. Any way my advice is to clean your top-load dispensers regularly if you use fabric softener like me.
Mike
Mike