I thought it was dust!

I have a long narrow raised bed and had planted winter pansies. Everywhere else they thrived but in this bed they were dying. I lifted them, saw the dust on the surface...looked closer.....Yugh, millions of itsy bitsy greenflies. Promptly sprayed with warn soapywater - have I done the right thing? Will the bed need new compost? Any advice warmly received.
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yes you have ,wash them off with soapy water or with your fingers squash them.
Thanks rose - the bugs were covering the surface of the compost - thousands of them....I'd have been up all night squashing them
.....I've just had a look and they seem to be dead or dying now after their soapy shower.