Shops that clean air vents
 

Are there shops that professionally clean your air vents?

I can literally smell crap when I use my defroster with AC off. I tried using the foam in a can thing from lordco, where you spray into the vents and air it out, but didn't work.

I want to get right to the source of these bad smell rather than use some air freshener to cover it up.

did you check your cabin filter?

Almost any method found on google, I've tried it.

I wish I can stick something from the inside of my car into every duct and just push/scrape out everything to the outer vents.