On 11/01/2011 13:00, John Rumm wrote:
On 11/01/2011 12:33, Fredxx wrote:
I have a perfectly good chip fryer that is coated with caked-on old
sunflower oil.

It's sufficiently hard and thick that the detergents I've used haven't
touched it.

In the end I have put it all in the dishwasher and put it through a few
washes. Some of the crud has become emulsified and almost peels off like
latex. But there's a lot more to go and don't relish the thought of
another dozen or more washes in the dishwasher!!

Are there any detergents which successfully dissolve this type of stuff?

A soak in caustic soda solution might do it...

But not recommended if it is made from aluminium.