Sears model 717.. the dirt and grime can be scraped with a fingernail. When i tried to pull on it to see if it was repaceable I saw more dirt and crime. My children put a washing machine cleaner, but it is beyond gross to me. it just seems one does wash in dirt. Is this part replaceable? Is it expensive? I looked in the manual and it is not mentioned at all. I think I'll go back to wringer.