Found a new product for washing the scoob that's the best I've used.
It's called Wash Wizard. The most horrible bright pink colour but what a job it does.
I've got more cleaning gear in my garage than Boy George has makeup so this stuff had to go some to impress me. Bought it by accident as my local car shop was selling stuff off cheap and this was the last bottle. Give it a try and no I don't have any connection with the product.
Cheers
Alasdair