If shes clickin in forward and reverse but only moving forward the F/R solenoid/contactor
should be the culprit. Thats a series system....the F/R
contactor is flippin your polarity....the ONLY thing different when you switch directions is the polarity.....if it works in forward it should work in reverse (as long as its actually switching and making contact in whatever direction) now...the Navitas is a lil different animal than compared to other controllers. The Actual F/R switch on the dash goes to the controller then the controller switches your contactors from Forward to Reverse and vise versa. Since you say it "sounds" like its switching in both directions I would tend to believe the contactor has something in it or the reverse contacts just went south at the same time you washed it. If its still clicking when Forward IS NOT working then I'd really lean towards it.
Heres a good pic of what I mean by "OPEN" design.....you can clearly see the contacts inside.
