Check the rear wall before applying anything. A rough, matte panel where the side walls are smooth is a catalytic liner, and it is the cleaning system rather than dirt. Technika fits them at a price point where owners do not expect them, which is why they get destroyed.
Technika is an Australian-market brand sold through Harvey Norman and independent kitchen retailers, and it went into project homes and house-and-land packages across NSW in very large numbers.
It also does something unusual for its price point, and that is the reason this page exists.
Catalytic liners, at a price nobody expects them
A good share of Technika ovens carry catalytic panels on the rear wall. That is unusual at this end of the market, where the assumption is reasonably that a budget oven contains nothing more sophisticated than enamel.
The result is entirely predictable. An owner opens an oven they paid a modest amount for, sees a rough dark panel at the back that looks like years of neglect, concludes nobody has ever cleaned it properly, and attacks it.
The panel was the cleaning system. Its coating oxidises fat during ordinary cooking above about 200 degrees, and abrading it or spraying it blocks and destroys that coating permanently. Our oven cleaning guide covers what a catalytic liner is and how a saturated one is regenerated with heat rather than chemistry.
The check takes five seconds with the oven cold. Run a fingertip along the rear wall and then along a side wall. If the back is rough and matte where the side is smooth and glossy, leave the back entirely alone.
The rest is plain enamel
Everything around the catalytic panels is ordinary vitreous enamel, and it takes a non-caustic cleaner, a genuine thirty minute dwell and firm work with a non-scratch pad. Repeat rather than escalate.
Keep cleaner strictly off the rough panels, which means spraying onto the cloth rather than into the cavity, since anything sprayed at the roof runs down the back.
It came with the house, in a street of the same
Technika was fitted as a matched three-piece package in project homes, so whole developments carry the same oven, hob and hood. Yours is very unlikely to be unusual, parts are stocked because volume in a few models is what distributors plan for, and any quirk you find has been seen a few streets away.
It also means the matched Technika cooktop and Technika rangehood are the same age and, in the case of the hood, almost certainly untouched.
Support runs through the retailer
Technika is sold through Harvey Norman and independent kitchen retailers rather than through a manufacturer's own service network, and that changes where you go when something is needed.
For most owners this is a non-issue and occasionally an advantage, because a large retailer with volume in a few models tends to have common parts moving rather than sitting. Door seals and shelf sets for the popular sizes are generally straightforward.
Where it becomes awkward is with the catalytic panels themselves. They are a genuine replacement part rather than a consumable, they are model-specific, and on an oven that is a decade old the answer is sometimes that they are no longer available. That is worth knowing before deciding whether a scrubbed panel is a problem to solve or a fact to live with.
If the panels cannot be replaced, an oven that has lost its catalytic function is not broken. It simply becomes an ordinary enamel oven that needs cleaning by hand more often than it used to, and it should be treated that way from then on rather than kept on a regeneration cycle that no longer does anything.
What actually goes wrong
A scrubbed catalytic panel. The defining Technika mistake, made because nobody expects a liner at this price.
Cleaner sprayed at the cavity roof, running down onto the panel behind.
One application and a conclusion, on enamel that needed three.
A hood in the same house that has never been opened, which is why the oven front keeps getting greasy.
Should you do it yourself?
Do it yourself on the enamel, once you have established where the catalytic panels are.
Get someone in if a panel has already been scrubbed and you want to know whether it is salvageable, or if the oven has years of hard carbon on the enamel areas.