Here is my mixtures I found on the internet a while back. And use it just as described.
◾Heavy flux:
Ideal for tinning wires and heavy de-soldering jobs
60ml of solvent – 6 grams of rosin
◾Medium flux
Suited for most applications
60ml of solvent – 4 grams of rosin
◾Light flux
Used mostly in drag-soldering:
60ml of solvent – 2 grams of rosin