Cracking it open and physically cleaning the unit is likely your only option.

I'm not sure what the warranty covers precisely, but there's a good chance that having bugs inside is already a warranty-breaker.

Be careful about where you keep the units in the meantime. Maybe seal them off until you can clean them properly, outside of your home. The last thing anyone wants is to "inherit" someone else's bug problem. Roaches likely won't stick around in a clean house (no abundant food supply), but something like bed bugs could haunt you for years.