I've given up. The only thing i imagine could work is if i bring the cabinet with me to shower. I've seriously thought about it. Not joking
I do that. I mean I take apart everything electronic from the cabinet, even the usb headers and rest goes to the shower room with the side panels, I put PH neutral car wash shampoo in a spray bottle, I spray that into all the nooks and crannies, and use any general purpose soft brush all over it. This is what gets the sticky dust out. The places where a brush can cause scratches I just use my hand to rub the sprayed soapy solution. At last I finish with rinsing everything off, blowing air into it to get the water out and wiping everything with microfiber and letting it dry.
The fans are the dirtiest including the CPU cooler one, for those I take them to washing sink, letting the tap water running very slightly so it doesn't splash everywhere on contact, I use toothbrush dipped in the earlier soapy solution to brush off all the dirt over the fan blades, then I place the fan under running water to get all the soap out, carefully positioning so water doesn't gets into the bearing.
For the motherboard nothing much can be done except using anti-static brush gently to get the dirt out where ever possible. The sticky dust remains and I don't bother with it, it's hardly visible. I prefer that over a totally clean motherboard which just stopped working.
For the CPU cooler heatsink which has copper, to make it shiny, I put some salt and vinegar into pan with water and mix it well, then dipping the heatsink into it. Bringing it to boil and leaving it like that for 10min, then brushing off the fins and copper. It's one way to get the surface oxide off of the copper. The more you leave copper in the air the shine starts to go away.
For the PSU and graphics card, I just blow air into it from all the vents, but making sure the fans doesn't spin by blocking it with toothpick. The graphics card backplate and the front fans and surroundings I clean with slightly wet microfiber and the same for the PSU chassis.
All the cables gets cleaned with wet cloth.
Then at the end of the day I assemble everything back and wonder how I wasted an entire day cleaning something that didn't require this deep cleaning and it would have worked just fine even if I didn't do anything to it. Followed by questioning my life choices.
