Dust, as we know from Little Britain's Marjorie Dawes, is low in fat. But even if you don't want to eat it, don't let it build up on your houseplants. Aside from looking ugly, it also stops the leaves from absorbing light effectively and can allow disease or pests to take a hold.
There are a number of products on the market, but don't bother buying any of them: they're totally unnecessary. If you insist on buying something, Tesco Value baby wipes work just as well as proprietary houseplant wipes that you'll spend much more on.
For hairy-leaved plants that don't like getting wet such as Saintpaulia (African violet) and cacti, find yourself an unused paintbrush or makeup foundation brush and simply brush away the dust. Leaves of houseplants with substantial rubbery leaves, like Sansevaria (which goes by the delightfully un-PC common name Mother in Law's tongue) and the entire Ficus family including rubber plants, can simply be wiped on both sides with a damp, warm cloth. (Some people swear by a mix of milk and water but I've never taken to the idea.) Anything with small, delicate leaves, like many ferns, can be misted with water to dislodge dust.
While you're at it, check whether the plant needs repotting, cut off any dead or dying leaves and check for pests and diseases. Do this regularly, and your houseplants will look much happier.
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