i dont know if this known or not but wth
this is simple method to cleanup your PS3 without opening it
1-Put your PS3 to a Vertical Position and your PS3 should be Turned OFF (not Powered On) .
2-Hold the Eject button and do NOT release it, now Power on your PS3 while Holding Eject button
3-now you will hear the Fan spinning and you can now release the Eject Button and if your PS3 is dirty you will see a lot of dusts coming out from the back of PS3 .
4-now wait a little bit the system will turn off Automatically .
1-Eject any Blue Ray Disks from your PS3 if there is .
2-Do not do this if you just shut down the PS3, Do it from the Literal Cold boot .
3- i am not responsible for any damage my happen to your PS3 so do it at your own Risk
at least how i cleaned up my PS3 from Dusts via this way .
hope this is guna be helpful for some ppl.