Hi chucknlisa,
Welcome to the Heartland Owners Forum and Family. We have a great bunch of people here with lots of information and all willing to share their knowledge if needed.
There are even more than what you have posted about cleaning the sensors... but not sure anything works good. We just usually dump on a weekly basis if gone that long or when it starts to burp. Or if we are only gone for a 2 or 3 days, I dump and rinse (use clear fitting to see) really good before going home I probably have not looked at the monitor panel 10 times in 3 years....
Think about joining us for the Heartland International Rally in Goshen, Ind. this next June... I know they don't have a bridge from HI to CA yet,,, but you could fly in and stay at a cabin or motel close by...
Enjoy the forum and wish I was near you... You live in a beautiful state. But we do to,,,,TEXAS is wonderful, come and visit.
Jim M