Dust Removal

I use compressed air. There is an electronics cleaner that is similar to brake cleaning fluid but it will not hurt anything electronic. Techs use it to clean switches and such. If the have air handlers for heating and air conditioning you need to have hi performance filters installed. They will improve thind dramatically. I would say in my house by about 90%. I would not worry about the stereo. I would worry about breathing that stuff in all the time. Read up on Silicosis! 

Oil dem chips in front of your house.

I don’t have a real problem with it but I do keep a microfiber cloth over both of my turntables when not in use.

I would start by trying to solve the problem of dust entering- that might be sealing windows with appropriate materials and looking at other places where dust or detritus enters the residence. I am now in an 1880's wooden house that is tight as hell, from a pest expert who screened every inch of the crawl space, to addressing window leakages- the house was restored to museum standards in 2004 but not all was practical. I've been addressing that as part of continual maintenance of an old house (I've had many).

Assuming you have done the best you can reasonably do on that front, what does your HVAC system look like? How tight are the filters? There's a trade off between filtering incoming air and efficiency and you don't want to burden your systems. I use MERV 11 filters that are 4 inches deep and HEPA stand alones in a few critical areas, including the record cleaning area.

The system room itself- I vacuum, but I have to be very careful around the equipment. I have a cleaning regime that includes using a fabric sticky roller for the platter, alcohol non fiber cloths to clean the tone arm rail and various things to dust- the Tiger Cloth, recommended to me by @antinn is not only useful for getting the odd post cleaning dust mote off an otherwise clean record, but a good dust cloth. 

It's a Sisyphean task in the sense that it is ongoing, but there are ways to reduce the amount of "pollution" that comes into your house. I'm not big on canned air b/c of the accelerants; I do try to keep the components relatively dust free. It's a large, dedicated room with a lot of records, a second room that is office and record storage and a utility area adjacent where the record cleaning equipment resides.

I'm OCD enough to maintain it. I'm starting to feel my age a bit. In ten years, will I still go through this? Don't know. Who does? 

Some very uban answers here.  Dust is a fact of life in dry rural areas. 

It won't hurt your gear.

Jerry