We have a frigidaire a/c wall unit with mold. Problem is the inside is styrofaom and scrubbing it will destroy the styrofoam How do I clean it??

Not 100%certain to what styrofoam you are referring to but there is definitely styrofoam components inside the machine. The entire drain pan is made of styrofoam, I would not touch it.

The foam is glued on,so you will most likely destroy it trying to remove if you don't be careful.

Check the drain tube between the evaporator side to the back of the unit. It may have a packing plug installed. If there is one remove it or clean the drain tube.

tilt your ac down on the outside,so it will drain properly,if that doesnt help,pour some bleach in the water inside to get rid of mold that clogs the drain

Any mold in any part of the unit is not good, especially if its in the Styrofoam, Styrofoam has pores and hides the mold spores well, it would be dangerous to actually run the unit with mold spores as it can travel inside the house. Unfortunately companies that make these units don't make these units mold proof, why should they? that's how they make their money. I have three units, one has always given me problems with mold. It always comes back. The other two are always clean. My best advice, get rid of the unit and get another one or get a free estimate on Central air and heat. Mold is very dangerous and is not worth the risk, it can cause a number of medical issues.

try to replace the Styrofoam cup then put on the top.. if the same happens.or it will be frozen it means styrofaom is .................................. then use another...

Hello,Lilo The styrofoam pack MUST stay in place.When in operation the air tempature is so cold the unit will condensate(create water)if not insluated.Your unit would LEAK all over the place.The blower fan is a PLASTIC composit and should not rust.

A solution of bleach and water will do. Just wet the rag and rub it down well. When this is done you may still have the marks but the mold is dead. If you want it to be completely clean you may need to replace.it.

try using liquid wash detergents placed in a plastic ball inside the drum, instead  of using powder placed in the soap drawer, because the residue of powder left in the drawer allows bacteria to build up, thats what causes the 'black deposit' you speak of, its very difficult to remove