I am a shoes-off-in-my-house kind of person. I don't know where your shoes have been...if you have a rock stuck in the treads and are going to scratch up my floors, or if you didn't notice the neighbour's dog's little treat he left on the lawn that you managed to step in. If you're embarassed to ask for shoes to be removed, then why not spell it out for people? (I'm not that anal about it, really, but I thought this was really cheeky).
P.S. My stones and wood garden ties just arrived from Rona. Let the landscaping begin!