This is for those who don't think that cleaning out your machine regularly is necessary. A guy at work brought me his M17x R3 yesterday because it was having a few issues. While I had it in a million pieces, I decided to check his fans and heatsinks. You can see that it wasn't a pretty sight!
Before:

After:

Make sure you check your heatsinks regularly to give your pride and joy the best chance of giving you it's best performance.
Before:

After:

Make sure you check your heatsinks regularly to give your pride and joy the best chance of giving you it's best performance.