Can't say i've ever had that problem using carb cleaner to be honest - brake cleaner as a substitute carb cleaner, yes but not carb cleaner.
However i think i'd clean out that engine oil and spray some silicone lube into the valve instead - less likely to attract dust and dirt and won't turn to a gunny residue like engine oil will. It can also be done without removing the valve from the car.
I suppose i should have a look at my EICV/AICV as well, it's 2 years since i last cleaned it and i have an MoT coming soon. That said i'm not experiencing any problems in that area but prevention is better than cure!
