White vinegar is an efficient mold and mildew cleaner to eradicate the fungi from the root. It is known to kill even the deadliest mold; the black mold. Contrary to popular belief, bleach is ineffective in killing mold and mildew. Using bleach makes the mold seep inside and grow out later even stronger, causing more damage.
Alternatively, you can also go for Tilex Mold and Mildew Remover Spray and Lysol Mold and Mildew Blaster for killing mold and mildew and removing the stains left by them.