Swindon breezed past 10-man Dagenham and Redbridge to move six points clear at the summit of League Two.
Josh Scott was sent off for a challenge on Oliver Risser shortly after Billy Bodin slid home Paul Benson's cross to put the Robins ahead.
Joe Devera headed home to extend their lead in the second half from Luke Rooney's corner, before Rooney himself got on the scoresheet with a low drive.
Former Daggers striker Benson completed the rout with an easy tap in.
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Swindon manager Paolo di Canio told BBC Radio Wiltshire:
"My demand is always very high, I ask for better quality, but when you win 4-0 at this point in the season and especially after the defeat against Oxford, it is never easy to start a run again of the same standard so they were fantastic.
"Obviously once again I ask too much and we can play better football but we scored four goals and we have to be happy with it.
"Today they answered [the defeat on Saturday] very, very well so I am happy because the gap between us and second place is more than before this game."