Do yourself a favor, check with a local landscape expert. As I understand it, you do not need to dethatch a Florida lawn, and the dead grass actually helps fertilize your lawn going forward, the "top soil" here is mostly sand and clay.
We have been here one 1.5 years, and have seen no reason to dethatch the lawn.
I may be completely wrong, so please check with an expert.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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