Its a fact of life.
Theyreeasy to clean, but a few partslike the video cardmay require a deeper shining once in awhile.
How much itll make a difference depends on your level of dust, of course.
Their card didnt improve much, which is actually a good sign that they cleaned itbeforethings got rough.
Video Card Running Poorly?
Clean Your Video Card Cooler!| LinusTechTips