Check the rear wall for a catalytic panel before applying anything, since some models have them and they must never be cleaned by hand. Otherwise it is plain enamel taking a non-caustic cleaner with a genuine dwell and a second application.
Baumatic is a British badge distributed in Australia, and it arrived here mostly through developers fitting out apartment buildings in the 2000s and 2010s.
Apartment fit-out, matched package
These were supplied as a set: oven, hob and rangehood, installed together across a whole building. The consequences are the same ones that apply to any developer kitchen and they are worth stating because they change what you should expect.
The appliance is as old as the block, not as old as the kitchen looks. It has probably had two or three owners, each of whom assumed the previous one had it serviced. And the matched Baumatic rangehood is almost certainly the appliance furthest behind, because nothing in ordinary use ever prompts anyone to open a hood.
Check for catalytic panels
Some Baumatic models carry catalytic liners on the rear wall. On an appliance fifteen years old they look exactly like a decade of neglect, which is precisely why they get attacked.
Run a fingertip along the rear wall and then a side wall with the oven cold. Rough and matte where the side is smooth and glossy means a catalytic panel, and it must be left entirely alone: scrubbing or spraying destroys the coating permanently. Our oven cleaning guide explains what they are and how a saturated one is regenerated with heat.
The enamel
Everything else is ordinary vitreous enamel with nothing to protect. Non-caustic cleaner, roof first, a genuine thirty minute dwell, firm work with a non-scratch pad, and repeat rather than escalate.
Parts, and the distributor question
Baumatic is a British badge distributed in Australia rather than a manufacturer with a local service network, and on a fifteen year old appliance that distinction starts to matter.
Common consumables like door seals and shelf sets are generally still findable for the popular sizes, because these went into apartment buildings in volume and volume is what keeps parts moving. Anything model-specific is a different question, and the answer depends on which importer held the brand when your Baumatic was sold.
Photograph the rating plate inside the door frame before you start. On a brand distributed rather than manufactured locally, the model and serial are what any supplier will ask for first, and searching the brand name alone tends to produce British results for appliances never sold here.
If a model-specific part turns out to be unobtainable, that is worth knowing before spending money elsewhere on the appliance rather than after.
What actually goes wrong
A scrubbed catalytic panel.
One application and a conclusion, on carbon that needed three.
A perished door seal, common at this age and frequently the real reason the oven browns unevenly.
A matched hood never opened.
Should you do it yourself?
Do it yourself on the enamel, once you know where any catalytic panels are.
Get someone in if the cavity roof has gone hard, or for the whole package at once, which is how these are best approached.