Xanti:
We normally get 2 to 3 thousand miles off a waxed chain before redoing it. Must say we do live in a very arid climate (Sonoran Desert in Arizona). When derailling chain becomes a bit noisy or might give a little squeak, it's time to re-wax.
Don't know your shopping situation in B/A, but if anyone deals in canning supplies/natural foods or a drug store may handle canning wax.Suggest googling parafin wax in Spanish . . . Don't know about your stoker's hair removal wax.
Have a friend, who years ago, actually used a product called Crisco, a vegetable based solid shortening for cooking . . . seems to have worked but did not last as long as the canning wax.
We do not us any other lubricants between waxings.
Have added some extra fine powdered graphite (about 1/2 teaspoon) to wax but does not seem to make an appreciable difference. Don't toss out that partially filled can of wax, as you can re-use it multiple time. Cheap/efficient/clean.
The process of waxing is less time consuming/expensive in the long run than having to wipe down chain and drip on some costly fancy-named lubricant on a regular basis . . . and it's clean and environmentally friendly too.
Pedal on TWOgether!
Rudy and Kay/zonatandem