The optimal frequency of replacing the car's interior filter is twice a year-in spring and autumn. The minimum is once a year or 15 thousand km of mileage. By cleaning the air in the cabin from dust, insects and allergens, we get rid of coughing and sneezing. But gradually the filter becomes clogged and ceases to perform its functions. And when the time of its replacement comes, many people, after looking at the price tags of new filters, decide to restore the performance of the polluted old one. But still, if you are in doubt whether it is better to blow and knock out the old filter or buy a new one, we recommend reading this article. read more