I have some dusty (NOT mildewed nor moldy) spots on my bathroom ceiling
that I would like to clean.

However, in my past experience, residue from soaps provides food for
mildew and I ended up with mildew in the spots that I had cleaned with
soap.

What kind of cleaner or detergent can clean a bathroom ceiling without
leaving residue that mildew can feed on?




-- Steven L.