Cabbage / Grey Aphids on Broccoli

[agee12]

I was doing cut and come again on my kale and mustard greens and noticed that some of the leaves on my broccoli plants were curled. I examined the leaves and quite a few leaves had these gray clusters that I thought were eggs. Every leaf that had the cluster I crushed between my fingers and all but a few leaves I cut off the plant.

I did a search on the internet and determined that they were not eggs but aphids, specifically cabbage aphids or grey aphids. (picture)

My biggest concern is my broccoli heads which are just now forming, I don't want those [expletives deleted] infesting my broccoli heads!

My next step is to douse the leaves and the part where the heads are forming with a mint tea and dish soap combo, I'm going to do this tomorrow evening.

Has anyone else had this pest and if so how did you deal with them?