Spellcaster cleaner, warrior cleaner, machine cleaner, rock cleaner, fiend cleaner, fish cleaner and even insect cleaner. Why still no dragon cleaner? Dragon is just too op nowadays. Konami isn't fair I think
For spells, I mean. There are some monsters to get the job done for dragons, too. But I see what you mean about not having a straight spell-kill for dragons like they have for other types (insects, spellcasters, etc.)
Eradicating Aerosol can be used in conjunction with Parasite Paracide since it makes all monsters your opponent controls insect type.