phone dropped in sea water

Whilst on holiday last week I had my personal mobile in a waterproof ( or so i thought) bag and this was dropped in the sea. Straight away, after realising that the bag was not as waterproof as I hoped, I pulled the phone apart dried it with paper towels and left it to dry.

I have thoroughly dried it out, hot hotel balcony and at home a radiator, then a bag of uncooked rice (5 days now).

However I have since got home and read online that I should have rinsed the phone in tap / de ionised water or alcohol first, prior to drying it and that the residual salt is likely to foul it up if I turn it on... (Makes a lot of sense if you stop to think about it - rather than panicking about getting it dry.)

Not wishing to completely wreck it. I have not yet turned the phone on or rewet the phone..

What would you recommend to hopefully bring the phone back to working order without further knackereing the phone.

I am a little cautious as I do not have to pay my £200 excess for water damage on my insurance.

Would rinsing the phone now, do anything to remove the now dried up salt? what would be the best rinse - de ionised water or isopropyl alcohol?

Any other advice?