filthy however is another thing entirely
iv'e been through thousands of sticks of hot roll tube and never seen anything like this.
but ultimately i agree, setting up some steel sawhorses outside with a little pressure washer for future tube. something i have always wanted to set up anyway so no time like the present.
As I mentioned prior--consider using KleenKote or Redkote pre-primed tube. The cost differential ain't that much.