I cleaned out my 2012 Retina MBP (Pictures!)

[elf69]

The more you clean your house the more dust you put it the air and sucked into a laptop/pc.

Not saying do not clean your house but it a fact.

my old windows pc was lagged in dust in house.
My pc in the shed was not so dusty as don't clean shed very often lol.

all machines need regular cleans

 

[b_scott]

From someone living in the city this doesn't look excessive after 5+ years. I can't keep my counter dust free for 30 mins. Construction and traffic are tough on the lungs (and fans)

All depends on where you live and how often it is used. When I lived on the beach the sticky salt air made things even worse. Those machines became impossible to clean.

Same. Live in the city of Chicago on a main street. Our everything is covered in dust constantly.