https://www.motorkar...ader.php?cfile=tnjgk
Cleaning the air filter
The air filter can be cleaned according to the following steps. Generally we
recommend to contact a professional mechanical service for cleaning the
air filter.
1. Loose the screws of the air filter cover and remove the cover.
Remove the air filter.
2. Clean the air filter with a suitable detergent. Therefore the filter needs
to be put in this detergent for a while.
3. After the cleaning the air filter needs to dry completely.
4. Immerse the filter into engine oil.
5. Re-install the filter and the cover.