Well I fished the head out of the dishwasher along with the breakfast things and I'm well impressed with the job it did. Even cleaner than after the ultra-sound cleaning. This will be a go to method in the future. Unfortunately although it was clean and a uniform colour, instead of the blotches, it is now a uniform slightly darker grey than before.
A couple of sessions in the ultra-sound again, has reduced the darkness a bit.
A little practice with the Autosol and toothbrush again did induce a faint shine so there's hope with plenty of elbow grease, I found a splash of vinegar seemed to help?
I have plenty of sharp sand as it happens Nasher, I had two jumbo bags delivered today. These are now under armed guard overnight.
I can see the sand in the bag working on smaller parts, but the head is too large I think.
I know what you mean by a rumbler or tumbler. They use lozenge shaped abrasive blocks and do a fantastic job of cleaning parts up. It did occur to me that maybe an ultra-sound cleaner could be employed in a similar way, perhaps using ceramic beads in a liquid medium.
It's not something I am going to try with a borrowed U-S cleaner, but I reckon it might work with the beads and workpiece in a cloth bag suspended in the vibrating liquid medium.
I think I have some of those cup brushes Jeff, so I might try that too.
thank you for the heads up with the brass brushes too Stevie.
As for the todger method, The thing is BRD, I want to get into the fins as far as possible and I think I would be limited by length. Some of those fins are a good two inches deep! Besides which the Norton is already fu…..