Maximizing life of 4 stroke rotax engines

Hi, I hope you find this useful.
I have a 2009 speedster 150 scic 255hp boat.
I accidentally came across an Australian company promoting what is described as below - they sold me the setup for $30.
Basically, after flushing (salt or fresh) moisture remains in the exhaust.
This moisture can migrate through open cylinder exhaust valves into the cylinder...