
The best way to clean a grease filter is in a dishwasher and often but if yours isn’t dishwasher proof or is particularly messy then washing it by hand is often your only choice.
There are two kinds of grease filter; mesh and baffle. Mesh filters are, rather predictably, a mesh that catches particles of grease as they pass through. You can buy disposable paper meshes or the reusable metal kind.
Baffle filters are made of parallel metal plates onto which warm grease particles condense like water vapour condensing on cold glass. Baffle filters are more common in large cooker hoods or professional kitchens and tend to be dishwasher safe.
Tackling cooker hood grease
As well as droplets of fat a filter will also catch particles of dust, small amounts of airborne debris and anything else that is light enough to be sucked into the hood. When this cools and any water evaporates off it the resulting substance is a slightly tacky, yellow-brown gum. The best way to soften this is to heat it up so make sure that whatever you do you have access to plenty of hot water before you start cleaning.
As well as hot water you’re going to need a degreasing agent and here are some of the most popular;
Washing up liquid – a common degreaser that everyone has in their house and that you can use without taking any safety measures.
Washing powder –stains on clothes often need a similar treatment to stains on pans but be careful and make sure you read the instructions on the packet.
Vinegar and/or lemon juice – for tough grime neat vinegar is supposed to work wonders. I’ve seen Kim and Aggie do it but I’m still not going to guarantee that this will work (or that it won’t leave your house smelling of vinegar).
Bicarb – some people recommend making a paste from bicarbonate of soda and then scrubbing it into grease but bear in mind that this is an extremely bad idea if your filter is made out of aluminium – it would be like pouring acid onto it.
Scrubbing
Scrubbing a baffle is pretty straight forward; stand it on end and work from top to bottom. Cleaning a mesh is harder because deposits of grime build up between the strips.
The trick is to use very hot water. Start by lathering it with washing up liquid (or vinegar or bicarb) and then add hot water straight out of the kettle (always being careful not to scald yourself of course!) Leave things to soak for about twenty minutes or until the water is cool. The aim is not only to let some of the grease come out in the water but to keep it warm so that it’s easier to scrub. When scrubbing it’s best to use a stiff bristled brush rather than disposable scourers because once a scourer is covered in gunk it becomes useless and you have to get a new one.
The more often you clean your filter the easier it is to do. If you only pull it out once in a blue moon (or move into a flat where the previous owner didn’t bother washing it) then the simple truth is that no matter what you try it’s going to be a long and messy job.
If you’ve got a better way of cleaning the filter in a cooker hood then let us know because we genuinely want to learn it for ourselves.