Hi and welcome.
Further to what @OldRoutard has said it can take days to dry well in a flow of air and ensure you dismantle the phone to get air around the modules and help dry the contacts.
For the dampness indicators you will have to dismantle the phone to the point where you remove the screen and then see this post and two above it.
hopefully you don’t see a red square. The top left in the top image is the red square in the bottom one.
