Factitious creation high temperature is high wet environment, stimulative formaldehyde is released.
Can close door window, use air conditioning humidifier (high-power humidifier, can buy secondhand humidifier) raise indoor temperature and humidity, let formaldehyde be released to the top of one's bent.
Next everyday reopen window is ventilated in the evening, blow the formaldehyde that releases.
20 days such iteration, the effect should be very pretty good.
This is cost lowest, hold what feel embarrassed spends lowest to eliminate formaldehyde program.