On Jun 8, 11:57*pm, "CWLee" wrote:
"Joe" wrote:
Where do you live?

Greater Los Angeles.

What kind of trees?

Cedars, cypress, pines, birches are the ones from which I
get the troubling sap.

Deciduous sap is different from
evergreen, cactus from bananas, etc.

I didn't know that. *Do you use a different product for
deciduous, evergreen, cactus, bananas, etc?

Your university agriculture extension service should have experts
familiar with the common tree types of the south west. Since most tree
saps are aqueous solutions or suspensions of the resinous matter,
using a solvent/dispersant similar to the natural ingredient probably
works. You could experiment with ammonia, for example, or common
solvents for pine resins like turpentine, but other materials may not
be available in California because of pollution regulations. Whatever,
good luck.

Joe