You often run into painters who've used alkyds or oils for years and don't want to switch, but the oil is a natural food for mildew. Mildewcides are not as effective in flat oil. The battle against mildew is far from over. Just as Lex Luthor kept coming up with new ways to defeat Superman, those spores keep coming back for more. A complete mildew treatment system is your best defense, but even at super strength, it's only a temporary one.
Researchers hope to find a permanent solution for getting rid of mildew, given time.
After all, it took 50 years for Superman to meet his doom.