They could be paying £200 per pub a month if cleaned weekly.
A lot of pubs use to get cleaned weekly in and out,weatherspoons still do.
As for paying in beers don't think the ones I do would ever go for that there very strict on getting there invoice as they get regular audits,they were also quite up on there health and safety and asking to see insurance.
Do you get the old "must wear glasses if paint is flaking spiel lol"
Lol yeah something similar made me sign a working at height document for a ground floor pub as well.