On Jan 29, 3:48*pm, "Mick." > wrote: (Snipped)
> Has anyone any advice please?
I administer maintenance contracts for the USMC, and have experienced
some quite good home appliance repair with selected contractors over
the years. As advised here, I would first call the manufacturer for
cleaning/removal information, then I'd call a local appliance repair
person to come clean out for me. I say call someone else to come
clean out only because of my various arthritic concerns, as cleaning
on my own could be too painful.

Funny story on my own oven burn problem.... I used to work with a
Master Guns WM that knew she could get over on me by simply stating
something along the line of "Miss Jeanine, you are the only one we can
trust to do this well, so...." Just as I was to leave for the day
before a pre-planned, between Christmas and New Year's all-hands
feast, she plopped two huge hams on my desk to be dressed and roasted
that night. I was already perparing something else for the feast that
was to take up all my oven space for most of the evening. After
midnight I dressed and placed the damnhams into the oven, only on 250,
to heat-blend in their coating of JamLady's Apricot Pineapple, with my
brown sugar and mustard glaze, and then went to bed expecting merely a
four hour snooze. The smoke alarm woke me up an hour before my alarm
would have. The pans I had used for the hams were the "tin foil" sort
one buys at the grocers. Both of the pans had somehow developed wee
holes in their bottoms, letting the ham/glaze juices spill out and
burn over the entire oven bottom.

I called in my favorite, best appliance tech to come that day to clean
out the oven for me, suspecting that the bottom plate really had to be
removed to clean, He came while I was at work, he stood by while
using the oven's very high temp lock-clean process, after which he did
remove the bottom liner so as to properly clean off all of the burn
dust from it, as well as from below the liner where some had drifted
to. Everything was put back to right with the oven back together
correctly, and all was good. Hah! I came home to an all but
invisible soot covering everything in my kitchen and dining room, but
for the foot prints he left behind. His shop vac apparently had
leaked a good deal of the soot out that he'd so carefully vacuumed up,
and he was too hurried on to a next appointment to do anything but
leave me a tell-note that he'd be back by after I got home to then
help me with whole house cleaning.
....Picky