iffftwelve. The link provided by Plantladylin, mentioned the possibility I was going to suggest that you check out. The last and only time I tried to grow ivy in my home, it became infested with spider mites almost immediately due to the dry air. Last year, I was able to overwinter a couple of potted ivy plants successfully in my garage, which is unheated. Your decision to remove the affected leaves, shows that you're moving in the right direction. Be sure to rinse the leaves carefully after you spray with soapy water. You don't want to cause additional problems from soap residue. Your plant should recover and grow new leaves soon.
for the link Lin. It was very informative.