Thanks to my lovely sister-in-law for sharing this tidbit with me. If the build up on the detergent cap drives you crazy like it does me than this tidbit is for you. I use to rinse it off as the water from the washer was filling but now I don't have that option with my new washer. So I just throw the cap in with my clothes. The cap comes out perfectly clean and dry every time. Not to mention it uses every drop of soap in the cap so you don't waste any!