"The Natural Philosopher" wrote in message
news
On 04/08/18 20:37, ss wrote:
On 04/08/2018 19:35, newshound wrote:
I don't think even the old Methylene Chloride "Nitromors" will touch the
worst of it. Boiling, strong sodium hydroxide solution probably gives
you the best chance. Not recommended unless you are used to handling
aggressive chemicals.

The lacquers from oxidised oils and greases are *very* chemically
resistant. Otherwise you are down to mechanical methods (wire brush,
sanding disk).

Sodium hydroxide, (dangerous, 1 drop in the eye and you are blinded)
I think this is what the `oven cleaner companies` use but in gel form to
avoid splashes.
it would help if the parts concerned could be diassembled and taken
outside and soaked in a tray for an hour.
Available on ebay:
https://www.ebay.co.uk/itm/Sodium-Hy...wAAOSwc2FaFepm
Even sidium hydrxide does not work on this.

I have had an aga for 14 years....

Are you saying that that is a very fundamental design flaw
and that the only viable approach is to clean the enamel
top after every use or so for cooking so the fat doesnt
bet baked on ?

Have you tried conc nitric acid ? That should get it off, but isn't that
easy to get.