I am going to use either the berrymans 1 gallon cans of carb cleaner and fill the tank with that or methylene chloride, that should remove the varnish and sludge...

1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!