One use I have for borax is making cheap slime to remove dust on tough to clean parts. OLd PCBs with lots of electronics that wont air dust easily, car air vents, etc.
Most common mix is - Dissolve 1 teaspoon of borax in 1/4 cup (2 oz) warm water. - in a separate bowl, Mix 1/2 cup (4 oz) kids glue with 1/4 cup of warm water. - once everything is mixed properly, you can also add food color, glitters and whatnot. I stick to white so I can see the crap I capture and when its saturated properly. - Mix the content of the 2 together a lot
The resulting slime can be used later when sealed properly.
Don’t skip the water-glue mix, it helps with the end result.
You can capture a LOT of dust without creating airborn particles, or have something fun for the kids to play with.