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Contractors bid to work in a designated area. In an occupied home you have a responsibility to keep as much dust and debris out of the non work area. This is standard practice. To argue otherwise is bizarre.

Thank you for the ideas, @msg

I wondered about putting an air mover in the room, vented outside, and using a leaf blower to stir up as much loose dust as I can to be vented into the world.

Air compressor outside, for the stereo, printers, and all the exposed electronics on shelves is a good idea. I'm guessing I have to wait until May to do it =(

Is it paint dust from sanding or demo or something, and not overspray?

It's a combo of concrete dust from sawing and jackhammering our foundation, plus paint/mold ground off of the block walls.

It's thick, powdery, and inside everything. It ruined 10 rolls of filament because it's like it's magnetized and stubborn to remove by wiping and compressed air in a can, and it's legitimately in nooks and crannies like you wouldn't believe.

Air compressors will spray moisture and lubricating oil. Not recommended for electronics. At least not without a de-ionizing dryer installed in-line. ESD standards dictate those for a minimum. You'll also need a grounded air line as compressed air can build up a static charge. There's a reason that you don't see electronics repair techs using air compressors.

Those reasons are why "canned air" exists. It's dry, static free and non-conductive, made specifically for electronics.

https://www.officesupply.com/technology/computer-accessories/cleaning-maintenance/air-dusters/cleaning-duster/p788559.html?ref=pla&scid=scbplp788559&sc_intid=788559&msclkid=c3ab209179a1166b7280471ebb74f062

Using a leaf blower is a sure fire way to damage something. Unless you have a significant way to create enough displacement, kicking up a cloud of dust just to evacuate it with a simple air transfer is harder than you think and there will still be particles that are light enough to get kicked up by the massive amount of air a leaf blower will displace quickly but too heavy to remain suspended in air long enough for an evacuation system or air scrubber to be able to extract. In other words, it won't work.

Your best bet is to invest in an ESD Anti-Static Vacuum Cleaner meant for cleaning electronics.

https://www.northerntool.com/products/metrovac-datavac-esd-safe-anti-static-pro-series-vacuum-blower-120-volts-4-5-amps-70-cfm-model-117-117513-mdv-1esd-104687?srsltid=AfmBOoo6APxF1ZYPPgsSTiZXg3DMWhhidZtz30If8b7EwF_iZU1vW7byjG8&gQT=1

This is your best bet because not only will it prevent the vacuum itself from frying sensitive electronics with the static fields it generates but masonry dust can and will build up a static charge in the vacuum line and an ESD vacuum will have a grounded lead to dissipate that charge through the grounding system instead of your sensitive electronics. The vacuum will remove all of the dust without introducing static electricity or moisture.

If you're doing all these "mods" to electronics, you should have one of those anyway.

Got my grill going again, outta commission since 2008.

First thing to cook was hot tots & brats. Cut up peppers, onions and potatoes. Mix wishbone Italian with grey pooped-on mustard to make a sauce. Poor over potato’s and make a sealed bag with aluminum foil.
Use rest of the sauce to keep coating the brats and some large cut peppers & onions and grill away.

Yummy goodness…