Product review (4 stars): One all-but-fatal flaw
As preparation, we washed our drainer with scouring pad and soap and rinsed it. We then put a little white vinegar in a china cup and dipped a stiff tooth brush into it.  We scrubbed the rust off of rust spots, rinsed and let the drainer dry overnight so all vestige of dampness was gone.

The next day we (with me supervising, advising, kibitzing and my husband doing the work) put a newspaper on an outside table in the fresh air (70 degrees).  Armed with disposable plastic gloves, a bottle of 100% acetone nail polish remover for cleanup, some pieces of paper towel and cotton balls, we attacked the beautifully clean and dry drainer.

However there was an all-but-fatal flaw in our next step:  The Rerack needed to be thinned.  We put it on lumpy and it would not blend in to the adjoining rack areas.  We had thought that maybe the thickness was OK.  Further checking on the internet revealed we could thin it with acetone.  A possible way to do it, we think, would be to dip a straw a slight way into the acetone bottle, cap the straw with a finger so that the liquid remains in the straw until it is inserted into the Rerack.  We will try this next time.