Glad to hear the rx is working.
All lake water contains salts and when an electrical circuit board gets wet the salts deposit on the tracks. Whilst drying often restores the Rx to a working state it may not be 100% due to residue as kmbc says above.
I open the case and use iso Propyl Alcohol and a stiff paint brush to clean any boards that have been exposed. This ensures the board is clean and reduces the chance of further failure.
Another problem that might develop is the black wire syndrome so dismantling allows you to check the connection. I use WD 40 on the plug to drive out any water.

I have just checked with the owner and the receiver module is working again but the servo is lazy and has been replaced. The fresh water thankfully has not left visible deposits.

Airing cupboard is best or if you have a cat use the cat litter.
But the other problem you will have is the crystals left on the circuit board from the water will need to be cleaned of the circuit boards in the servos etc. Before you use them again or they will keep shorting out.

One way I have found was to put the wet items in a container of rice.I did that when my cell phone went into the water.I immediatly pulled out the battery and covered both with rice.
The phone still works.I forgot to mention use uncooked rice.