How often should I clean fans and heatsink?

Depends. I just cleaned my case fans for the first time since they were installed 5.5 years ago, and they only had a light covering of dust (I clean off the filters in front of them every couple of months though). Previous systems I owned with high-speed fans needed cleaning much more often. I clean stuff when it looks dusty, or it starts making funny noises, or gets hotter than it should, or if I happen to be taking it apart anyway.
Alright, thanks for the reply. Everything seems okay atm and I plan on taking apart everything when I get a new case soon so I'll clean them then.
 
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