I would clean it up now and watch it pretty closely. As was mentioned, I suspect it is a leftover from the final cleaning/winterizing process. If you clean it and then start to see liquid accumulating (I am assuming you are having a freezing/thawing process in the weather) it will confirm you have a problem of some kind and will hopefully make it easier to identify.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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