A Perth liquor store has been forced to put up a sign warding off customers who attempt to pay for alcohol with money fished out of their underwear and socks.

Cellarbrations in Nollamara put up the sign banning customers from paying with cash concealed in their clothes some time ago, but it was only recently picked up on social media:

The sign. Credit:Facebook

"Due to concerning health reasons, we will no longer be accepting any money that has been concealed in underwear or socks. We are sorry for any inconvenience, cheers for your understanding," it reads.

Cellarbrations Nollamara owner Michael Nicolof told 6PR's Simon Beaumont customers attempting to pay with sweaty money had become a "daily occurrence", and the sign became more necessary as Perth heads into summer.