What circuit or fuse for rear defrost on 99 Accord?

I am trying to troubleshoot a rear window deforster not working and can't seem to tell what fuse or circuit it is attached to. From looking at other posts, it might be the cigarette ligher/radio fuse.
The descriptions on the driver and passenger fuse blocks don't provide a good answer.
It seems like there is power getting to the wires but it doesn't do the job. Any suggestions?
TIA
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Fuse No: 18, 40A in under-hood fuse box.

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