Greenhouse propagators

I have a cool hobby greenhouse where I have been rooting mini and polyantha cuttings the past couple of years. It is 60* in there today (Feb 25) and I noticed a few aphids on the top new growth. In previous years I have not seen aphids in there until April and my action plan is to water spray everything and move it outdoors. This year it is about 4-6 weeks until I can safely put them outside. I did a spray tank of water washing today and will do that again tomorrow.

What do other greenhouse growers do? The rooted cuttings here are looking good.