cargo area is wet

'89 gmc S15 jimmy 4x4. the cargo area is wet all the time. I have not found any leaks from overhead. It's even wet when there hasn't been any rain. Any ideas why?

Use a garden hose with low water pressure to simulate rain water, and watch it roll!

Check the line to your rear window washer nozzle. Fairly common for the rubber line to crack and leak washer fluid.

Check the line to your rear window washer nozzle. Fairly common for the rubber line to crack and leak washer fluid.

I do not have a rear wiper or reservoir.

Hole in the floor or wheel well.