Mary,

For scale you need something to break down the hard shell. I like a mix of
1 quart water, 1 quart alcohol, 1 + tablespoon each of cooking oil and mild
liquid dishwashing soap. Treat at least twice (a week or so apart).
Repotting is very beneficial. If you repot, treat the entire plant with the
solution that you use on the leaves.

For lots more good information on natural remedies, visit

www.firstrays.com

Diana