An efficient Wealdstone took the few chances on offer to ease past Harrow with a 4-0 victory at Earlsmead.
The hosts started brightly but Mark Bentley slotted home for Stones on the half hour mark.
The away team put the game to bed after the restart with two quick goals – the first coming from a close-range Michael Malcolm finish after a storming run from Tom Hickey.
Luke Pigden tapped the third in from a free-kick which was dinked over Harrow’s ineffective wall.
The resounding win was wrapped up five minutes from time with Tom Collins’ superb volley in the middle of the park left keeper Michael O’Keefe stranded.
Wealdstone entertain a young Watford XI this evening at Grosvenor Vale.
Boro also lost 2-1 at home to St Albans City on Tuesday night.
Dave Anderson’s side started promisingly and deservedly took the lead when Lewis Driver diverted a shot by Ben Long past keeper Joe Welch.
But a reckless challenge from Driver on Sam Corcoran resulted in a red card.
The Saints took advantage of the extra man as Steve Wales’ 25-yard strike brought them level.
The visitors scored the winner after 61 minutes when Wales netted his second goal of the game.