Tomato seedlings

I have grown some tomatoes from seeds, they are quite small at the moment, but seem to be healthy. However, I have used a tray divided into cells which I bought some viola plug plants in a few weeks ago. I am now concerned as I didn't wash the tray before using it. If the violas had been sprayed with any pesticides during cultivation, is there a risk of any residual chemicals contaminating the tomatoes, and should I get did of them and start again?
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Your seedlings should be fine though.