Noel O' Sullivan Furniture in West Cork sells a Black Spot Remover for Garden Furniture that is suitable for use indoors. It has an acid base but does a great job.
Is about €10 and chances are ...
There are some sites out there, try searching in Yahoo or Google and you should come across some of them. But if you are buying furniture you should try and get to a shop if you can.
If you are suffering from it most in the morning, then it could be your mattress causing the worst problem. Dust Mites are commonly found in the wadding in in Interior & Pocket Sprung Mattresses.
...