Vents are easy. I suspect you mean ducts. For the most part, you don't
need to worry or clean them. On the other hand if they really do need
cleaning, it is usually best left to the professional with the right
equipment and in some cases special skills.
having a new HVAC installed next week and getting 25 yr old ducts cleaned.
they use a mechanical rotating brush, seal the system and suck it out. for
$355 it is worth it to me, as I have serious allergies (so medical deduction
too) and done in 2 hours. It would take me forever (literally) to
accomplish any sort of serious duct cleaning. YMMV
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