Besides formaldehyde, what is the best?

Nothing has been proved to eliminate formaldehyde now.

The main method to eliminate formaldehyde is ventilation, which is based on the principle of air. After renovation, the home should be ventilated for at least half a year, so as to minimize the formaldehyde content. Because in general, formaldehyde will exist in nature and wood for a long time, and it will be released continuously.