Exemple:
Don't bother <em>wiping your feet</em>, just come in. The house is a mess and will be totally cleaned tomorrow. 
Licence photo:
CC: Attribution, Commercial Use
Regionalism:
Neutral
Regional variant:
Neutral
Full Expression:
Etiquette: wiping your feet
To rub the bottom of your shoes (not your actual feet!) on the doormat before you come into someone's house. In some cultures is is acceptable to wear shoes in the house if you have done this; in others it's customary to take your shoes off.