Welcome to the forum.
This link shows that Rockford Fosgate receiver.
https://images.boattrader.com/resize/1/61/74/7856174_20210419092411374_1_LARGE.jpg
Internal drying works best with an internal heat source, such as an amp or lamps. I've had luck w/ fogged gauges by operating the running lamps and covering w/ a towel. Now I use my custom dash cover to ensure rain and garden hose doesn't cause fogging.
Remember that the receiver should be sealed. Disassembly w/ careful seal and mating surface cleaning might restore the water integrity.
There should be a nearby access panel that was used during assembly to permit removal / replacement, perhaps under the dash overhang.
