On Sun, 22 Mar 2015 20:57:43 +0000, Ian Jackson wrote:

In message , Andrew Gabriel
writes
In article ,
Tim Watts writes:
On 21/03/15 11:34, stuart noble wrote:

Washing up liquid is perfectly formulated for kitchen oils and fats

But from experience, not as vicious as SS.

It's one thing that seems to still work like it should and not been
weakened by eco regs.

Whilst you need to wash off as much as you can (as that's what carries
the dissolved grease away), you will not be able to wash all the cleaner
off. Some SS residue is usually OK to paint over, but I would not be so
sure about washing up liquid residue, and cheaper WU liquids are
sometimes loaded with lots of salt too, a combination which might
end up attracting moisture.

Two suggestions:
Strong caustic soda
Ammonia

Bit nasty.
If the area affected by the cooking fat isn't too big, perhaps one of those
terpene-based cleansers might do it (the orange-peely stuff).

About 15 years or so ago I was trying to remove splashes of set, old, ghee
but nothing that I had to hand at that place would touch it.
--
Peter.
The gods will stay away
whilst religions hold sway