Drop the aluminium mesh filters and soak them flat in hot water with a non-caustic degreaser. Never put mesh through a dishwasher. If the hood recirculates rather than ducting outside, which is common in apartments, replace the charcoal filter rather than washing it.
A Blanco hood arrives as the third item in a developer's matched package and is, with striking consistency, the appliance in that kitchen nobody has ever opened.
The general method, filters out, soaked flat, then the impeller housing behind them, is on our rangehood cleaning guide. Two things about this situation matter more than the appliance itself.
In an apartment it probably recirculates
Blanco hoods went overwhelmingly into apartment buildings, and ducting a hood to the outside of a multi-storey building is frequently impossible. So a large share of these are recirculating: they filter the air and return it to the kitchen, using a charcoal filter behind the metal grease filters to handle odour.
Charcoal filters are a consumable. They are not washable, they are replaced every six to twelve months, and washing one produces a wet obstruction that restricts airflow without helping smell at all.
In practice, a very large number of Blanco hoods in Sydney apartments still carry the charcoal filter the developer installed. If nobody has ever replaced yours, the hood is currently doing nothing for odour and has not been for years. That is the single most likely finding on this brand.
Ownership changes hide the neglect
An apartment typically changes hands every few years, and each owner reasonably assumes the previous one had the kitchen serviced. Nobody has. The hood accumulates quietly across three owners because it never fails outright, it simply extracts less each year.
If you have bought an apartment and inherited a Blanco kitchen, treat the hood as untouched rather than as maintained. See how to clean a Blanco cooktop and how to clean a Blanco oven, which will be in the same condition.
The impeller behind the filters
With the filters out, look up into the hood with a torch. The impeller sits in a housing above it, and on a hood that has run for a decade without attention that housing carries a hard brown lacquer of everything the filters missed.
That single deposit is behind all three complaints people actually have. The smell is warm grease in a warm housing. The noise is an impeller thrown out of balance by uneven build-up. The poor extraction is a loaded fan simply moving less air.
Isolate the power at the wall or the circuit breaker before anything goes near it, because hoods are frequently wired to a switch that is not obvious and an impeller starting with your hand inside causes serious injury.
What actually goes wrong
An original charcoal filter, years past replacement, in a recirculating install.
Grey mesh filters from a dishwasher cycle.
A hood that has never been opened across two or three owners.
Should you do it yourself?
Do it yourself for the filters every couple of months, and check whether there is a charcoal filter behind them.
Get someone in for the impeller housing, or if you have just moved in and want to know what you have actually inherited.