Smile, be polite, turn up sober.

I have had a few punts where I have come straight off the worksite doing a big day of manual labour - politely asking for a towel for a refreshing shower is a winner.
Plays REALLY well with the Aussie matures who like that 'hard working tradie' fantasy.

It's getting to the point I'm tossing up wearing the hi-vis down to the shops.