The number of volunteers will vary, depending on who has spare time that day.
A civil engineer, Mr Sarfo formed the group in July 2023 with just five people. He called it Buz Stop Boys, knowing the name would resonate with the public.
"The rich and poor, everybody knows what a bus stop is," Mr Sarfo said.
His small-scale initiative has now blossomed into a movement, with more than 40 men and women - from midwives to carpenters to military officers - joining.
"Social media has been key in getting more people to join our movement," Mr Sarfo said.
"Through our videos, we’ve been able to change the mindset of some people, but there’s still a lot of work to do."
It also led to a group of UK students visiting Ghana during their summer break to help with a clean-up operation in Ablekuma, an area in Accra notorious for its waste disposal issues.