Indoor air ducts needs proper maintenance for neat and good performance. Unclean air ducts causes viruses, bacteria, and other germ, which can harm your health. And when dirty air will flow to our house it will produce a bad smell and spoil the chair,table etc.
Take a small bucket with water and detergent and a spray bottle fill with vinegar.
Take all the required item that you want for cleaning arrange them with in your reach so that so can use them easily. Find the air dent in your house then keep away the remaining item or objects like painting, chair etc so that it wont get dust.
Take the air dent carefully because some of them rust in it so that it can scratch you.
Take a ladder, step-stool, stable chair, etc. Make sure that the ladder is sitting perfectly it will displace under your weight. Use the vacuum cleaner nozzle for removing the dust inside the air duct. Use the cloth to wipe out inside the duct with help of water and detergent and close the duct. Then do it for all other duct. Cleaning the vents is a quarterly job if you're keen to ensure air quality.
If you cant able to do the cleaning means you can hire the persons who experts in duct work cleaning. You can find them in online. In Australia there are many duct work cleaners are there for you to clean they are also have 2 years experience in that field.