We have the mold remover 2x used: For the first time in the bathroom - something had above the actual, tiled shower area, the (normal dispersion color painted) drywall yet gotten a little too much splashing. After 15 minutes exposure, the (zuegegeben few) black patches had disappeared completely. Even after weeks previously came to nothing. Second was to use a roller shutter box - here also some mold had formed - under the latex paint came first to light dark areas - particularly in the corner at the transition to the ceiling. Again, everything was gone after 15 minutes of exposure. Then you go again with lots of wet cloth over it and washes from the treated areas. A day or two has you a little "pool Aroma" in the air - but absolutely tolerable. It is only important that you, the environment (and yourself) covering very clean - otherwise there may discoloration - the means bleaches. Overall, the mold remover has complied fully with expectations - 5 stars.