Borough have said goodbye to one of the club’s stalwarts of recent times, as the full-back announced he was looking for regular football, probably at Bostik League Premier level.
It came after Hampton beat Welling United 1-0 on Monday to get their season back on track.
“He’s been incredible for me,” said Dowson. “I just had to give him a hug after we’d spoken.
"He’s been incredibly loyal, helping to save us from relegation in my first season here and then sharing in our title win. I can’t speak too highly of him."
Hampton have shuffled their pack again after last week signing four new players.
Centre-back Claudiu Vilcu and winger Kyle Spence have gone to Kingstonian, while Sam Gallagher will be on a dual registration with Met Police.
Chinua Cole has also moved on after finding it difficult to claim a starting position.