Honestly, another idle flush might be fine for OCD purposes. I second Falcon's comment about their Pro-Line Engine Flush. Let the car idle for about 15-20 minutes before your next oil change if you go with a product additive like that; as most of the solvent starts to flash off while hopefully taking with it (putting into suspension in the oil/crankcase) that which you are trying to cleanse away.
In an area with splash lubrication and does have moving parts, I can totally understand the desire to be as clean as you can since you verified a condition, did some cleaning and aren't wanting to do another manual diesel fuel cleaning.
What you did probably is enough, but if you "just want to" go with an idle flush similar to what Falcon suggested. I have used that product and also Amsoil's flush with decent results (more insols in the UOAs as well as apparent / visible deposits when draining the used oil from the catch pan to the container for recycling). However, this is typically in a new to me used vehicle I'm bringing up on maintenance and when there is evidence of lapse of service (long dino oil changes/not topping off etc) that manual cleaning may not get all.