I usually let them borrow a tool but stand there while they use it and help out a little then get it back before I walk back to the house. You always want to finish the job faster when you have someone looking over your shoulder!

And as far as lawn equipment and pressure washers I'd say no and just keep my driveway and yard looking meticulous and hope that it makes them jealous of how good it looks. It works for me, every time I mow my yard it seems to cause a chain reaction around me! To bad nobody pressure washes the driveway like me but they give me the evil eye as they know I have the upper hand!