Johnson´s Kleer

Is there anybody here who has experience with airbrushing KLEER ? I do not want FUTURE, but the good old Kleer. Both are not the same.
Up to now I am applying it with a brush. It works very well.
But I want to apply it by airbrush now, if possible.

1. Does it have to be thinned, and if yes, what to use for ?
2. How can I clean the airbrush ?

Please no opinions, but experiences.
Thank you,

Roland