My neighbor is an appliance salesman/repairman. He said the reason this happens is because we use way too much detergent. He said it is so concentrated, all we need is LESS THAN 1 Tablespoon of detergent, a light 1 TB! And don't put it in twice, (I have two spots to put the detergent in, one covered, one not covered) Since I have cut way back on my detergent, it lasts much longer of course, and I haven't had the gunk problem at all. Dishes are just as clean as they were before too.