Tilex, I had a mildew problem in a bathroom and it cleaned up great. Just make sure it's venilated well in there, it has a strong smell to it.

It sounds like the primary drain is clogged, and the secondary drain is working as designed. The discharge is put in a very visible place to provide an indication the primary drain is not working correctly. Find the end of the primary drain and use a shop vac to suck the line clean. A wet rag wrapped around the shop vac line and primary drain end will make an adequate seal in most cases. You can also snake the line, or gain access to the pain inside the unit and try compressed air to blow it clean. The shop vac usually does the trick though.

I have an original cast iron sink that has an overflow compartment that is rusted. My problem is that i had the sink professionally sprayed by a reputable comanyvin Buffalo NY. shortly after I noticed rust around the overflow holes. That led me to looking beniethvthe sink where I found that there is a small pocket where the water ends up going and it is rusted in there I assume from the standing water what can I do to get the rust out? Maybe pour coke in there? they say it desolves rust. Please any suggestions?

How are the sinks trapped? Common trap or separate? If a common trap is used check and see it the drain line is partially clogged beyond the trap. One sink will fill the drain line for the other, and then the water will slowly drain away past the partial obstruction. Bleach can only kill things that are present, if the source of the mold remains and the line is not cleaned it can quickly return. You may need a large 'bottle' brush to scrub everything clean. Unless you remove the trap and close off the line from the sink any bleach solution is going to run off before being very effective. Boiling water will have the same issue. Neither will contact the entire surface inside the pipe.