Just Fishing
Can't fix stupid
I wouldn't even risk drilling with an engine in the bay! That's metal shavings directly injected into the oil galleys. All it takes is one tiny speck of metal to take out a bearing or lifter.
Ditto.
I would prefer a full engine dissembly so you would be clear to use soapy water and a garden hose to ensure it gets a full rinse along with brushing.