Soak the aluminium mesh filters flat in hot water with a non-caustic degreaser rather than a dishwasher. Check for a charcoal filter behind them, since apartment installs frequently recirculate and that filter is replaced rather than washed.
A Baumatic hood came into an Australian apartment as the third item in a developer package, and it is almost always the appliance in that kitchen with the longest untouched history.
The chain of assumption
An apartment changes hands every few years. Each buyer walks through, sees a kitchen that looks acceptable, and reasonably assumes the previous owner maintained it. Meanwhile the hood never fails outright, it simply extracts a little less every year, so there is no moment at which anyone is forced to look.
Fifteen years and three owners later, nobody has opened it. That is not neglect by any individual, it is the predictable result of an appliance that never asks for anything.
If you have inherited a Baumatic kitchen, treat the hood as untouched rather than as maintained, and the Baumatic oven and Baumatic cooktop as being in similar condition.
Recirculating is likely
Ducting to the outside of a multi-storey building is frequently impossible, so many of these recirculate and carry a charcoal filter behind the metal grease filters. Charcoal is a consumable replaced every six to twelve months and never washed.
On an apartment hood this old, the charcoal filter is very likely the original, which means the hood has been doing nothing about odour for well over a decade.
Filters past saving
On a hood untouched for fifteen years, aluminium mesh frequently loads solid through its interior layers where no soak reaches. Hold one to a light after an hour's soak and a brush: if the middle stays dark while the edges clear, it is finished, and replacement is inexpensive next to letting the fan do the filtering.
The full method is on our rangehood cleaning guide.
What actually goes wrong
A hood never opened across three owners.
An original charcoal filter, fifteen years old.
Filters loaded solid, past any soak.
Should you do it yourself?
Do it yourself for the filters, starting with whether there is a charcoal one behind them.
Get someone in for the impeller housing, which on a hood this age is where the smell and the noise both come from.