More than $20,000 in donations, many from Liberal voters, have rolled into serial candidate Stephen Mayne's bold bid to unseat veteran Liberal backbencher Kevin Andrews.

The Melbourne City Councillor, and long-term political donations reform advocate, is disclosing donations on his website as they come in, and it includes $10,000 from anti-pokies campaigner Paul Bendat.

Melbourne City Councillor, anti-pokie campaigner and shareholder advocate Stephen Mayne is challenging Kevin Andrews in the seat of Menzies. Credit:Justin McManus

"I'm getting lots of emails of support and some donations from people who vote Liberal but don't like Kevin," Cr Mayne said.

The independent candidate has won the backing of high profile figures including Tim Costello and Nick Xenophon and is building a team of experienced campaigners who want to turn him from "serial candidate to serious candidate".