Sounds about right. My wife is also the one that will go out after I wash her truck and always seems to manage to find a puddle or mud even if it hasn't rained for days.
Drives me absolutely nuts.
I do my driveway and the sidewalks out front about once maybe twice a year. Clearly my neighbors aren't so anal about the exterior of their home as the sidewalk in front of my house is noticeably a different color than theirs.