I used PORs Marine Clean squirted into the fuel tube of my 74 Ghia. Let it sit for about an hour and then blew it out with my air compressor. As you don’t have an air compressor, perhaps use some carb cleaner with the power bleeder like Ed suggested. That sounds like it’ll work.
VW based 53MGTD - "MoneyPenny"
"If one thing matters, everything matters" - from the book The Shack