In Florida, cockroach allergens can stick around long after the roaches...

https://highstylife.com/why-do-roaches-hide-in-wall-cavities-and-appliance-motors/

In Florida, cockroach allergens can stick around long after the roaches disappear, affecting asthma symptoms year-round. Even tiny particles in dust can trigger flare-ups, making it important to keep your home clean and dry