Best Anti Flux Options?

Ive been wondering what people use for anti flux. Ive been doing it the tuff way and just cleaning off excess with sand papers, scotch brite and jewellers files on my guards. Im wondering if I might save myself a butt load of time using anti flux. My question is whats the best product and application that you guys prefer?

 

I have only ever soldered one guard on a knife and that was enough for me,.......never again.

 

I find it simple as long as you use the proper solder and flux.