Although I have the black, I think regardless of which colour you choose, a small amount of tlc won’t go amiss.
It’ll naturally vary a lot depending on your environment. For instance we have warm air heating, which I love, but because it blasts air around it can also stir up a very small amount of dust. And the wife refuses to let me install an air purifier, god knows why.
A gentle vacuum once a week with a soft bristled brush will keep it looking lovely. I’ve always done this with a lot of my equipment anyway, even before the warm air heating.
It’s surprising just how much dust can build up without you noticing. At a normal glance things look fine but if left unattended for a few months, a small deposit of dust can build up in awkward areas. Speaker grills especially, those can look great for a long time unattended, until you get up close and touch them.
As for fingerprints, I’ve yet to actually touch my HomePod beyond initially putting it in place. So fingerprints or other grubby marks don’t concern me. But a fine, soft microfibre cloth run over it now and again will keep it clean and shiny. I’d advise against using kitchen towels, I don’t think the top surface is glass (looking at the ifixit teardown anyway) and kitchen towel can be surprisingly destructive to plastic/Perspex/composite surfaces.
