After a wash cycle, the glasses & plates on the top rack looked worse than when we put them in. Very spotty and covered in something that looked like sand. After inspecting the washer, I found that the spray arm and wash spinner were both clogged and cracked. This was causing water to not properly flow through them. I tried to clean them with limited results so I decided to just replace them. They were extremely easy to remove and the parts cost less than $40. After replacing them, the dishwasher cleans like new. Simple and cheap fix with great results.