Artificial flowers do not wilt, and they do collect dust, which is the single thing that gives them away in a home.
Real flowers are replaced, so they never accumulate anything. Faux flowers stay in one place for months.
Dust settles on the upper surface of every petal and leaf, greying the colour and flattening the light. The eye reads that as artificial long before it reads the shape.
A dusted arrangement looks dramatically better and it takes five minutes.
Real-touch foam blooms of the kind at floroom.net have a velvety surface finish that holds dust more than a smooth fabric petal, so they benefit from more frequent light dusting rather than occasional deep cleaning.
The caution that matters. Water is fine on some plastics and bad on others.
Foam roses with a surface finish can mark or lose their velvety texture. Fabric petals can water-stain. Glued joints soften, and wire stems rust from the inside where you cannot see it.
Where water is needed for a genuinely dirty item, a barely damp cloth and immediate thorough drying, tested on one flower first.
An old trick for fabric flowers. A handful of salt in a bag with the flowers, shaken gently, and the salt carries the dust off.
It works on fabric and it is not suitable for foam or anything glued, and everything needs shaking out thoroughly afterwards.
Hairdryers on hot, radiators and direct sun all deform synthetic petals and fade them.
Cool air only.
An arrangement out of direct sunlight and away from a fireplace or a hob stays clean and unfaded far longer.
Kitchens are the worst place, because airborne grease binds dust to the surface and no dry method removes it.
Which is why position matters more than any cleaning routine.
Turning an arrangement occasionally fades it evenly rather than on one face.