First, let's decide what "Egyptian goose shit" is:
Loose Impediments
“
Loose impediments
’’ are natural objects, including:
stones, leaves, twigs, branches and the like,
dung, and
worms, insects and the like, and the casts and heaps made by them,
provided they are not:
fixed or growing,
solidly embedded, or
adhering to the ball.
So, if it's a loose impediment, what is our remedy? See Rule 23. Fair enough, though some impracticalities may still exist.