The answer to 'how to clean replacement' is to regularly clean or replace the air filters in your HVAC system. Air filters should be checked monthly and cleaned or replaced as needed, typically every 1-3 months depending on usage and indoor air quality. Dirty filters restrict airflow, reducing system efficiency and indoor air quality.
To clean replacement filters, first turn off power to the HVAC unit. Remove the filter and gently vacuum or brush off any dust and debris. You can also rinse the filter with clean water if it's very dirty. Allow the filter to fully dry before reinstalling. If the filter is damaged or cannot be effectively cleaned, it's time to replace it with a new one.