Dust.

Where is your studio?  What kind of building?

I'm in a basement and I don't have a lot of dust, but the dehumidifier runs 24/7..

The only real tip I would suggest is somehow filtering the air more.  Maybe when you're not in the studio put a few box fans around and put some kind of filtering material on their intake sides to help get the airborne dust out of the air.

For consoles and outboard, I use a paintbrush to dislodge the dust, and have a vacuum cleaner with a stocking over the end to suck up the dust. Keep the vacuum very close to the brush to get rid of the dust.

The stocking stops switches and knobs being sucked into the vacuum.
Old school console cleaning tip

Living in AZ, with a natural, desert-scaped yard that I'm regularly digging and planting in, dust is something I'm always battling. Dust in your gear will trap heat and moisture and you can actually see degradation in computer performance. Here's some of my tips;

How you rack and stack your gear is something to put thought into. In some of the studios I service, I see gear in the open, on top of desks, or with big spaces in the rack. When I go to change the tubes out, there's usually a large amount of dust inside. Whenever you have a space in your rack, use a blank panel (a perforated one if airflow is needed). Also, keep in mind that gear placed lower to the ground is going to gather more dust.

Trap the dust, don't push it or blow it around. Start at the top and go down. For chassis/faceplates/furniture, a swiffer can handle light stuff but at a certain point it's pushing it around. I prefer a barely damp cloth with just a drop of dish soap in the soak water. Be mindful how you pass over the vents so dust isn't being 'swept' into the spaces. For internals, an air-can handles light dust, but be sure to do it outside or have a well-filtered vacuum held a few inches off the board (so you're not building up static). For heavier stuff, various brushes will be necessary. Don't use the swiffer or a rag in your gear as it'll snag little fibers. Very dirty components/boards can be cleaned with alcohol but that's more than I'm going to get into here.

BE CAREFUL with compressed air as it will often blow dust further into the nooks and crannies of your gear, possibly creating real problems.

Furniture oil isn't necessary on most modern finishes and dust can cling to it so only use it where needed.

If you're doing everything you can, the dust will still be there but it'll be on your floor, so vac regularly and make sure your vacuum has a filter that is holding the dust and not just sending it through the exhaust. I actually like having a couple small rugs in a room as they become dust/dirt traps and I find there to be less loose dust in those rooms.

Nerdy side note; Though water-cooling a PC is traditionally a gamer thing, I actually noticed lower fan noise and far less dust since I watercooled my rig a year ago.