Hi sunnyc_up,
The best way to keep your Android clean is through best practice: do not install .apk's that have not come from teh official Google Play store, and carefully read the permissiosn that each app is askign for before installing it. If in doubt, don't install! There are many new threats seen targetting Android every week. Use yours with great caution.
Definitely protect your Android (and any Androids in yiour environment) with a security product as well. This article on Symantec's two available solutions may help:
Comparing Symantec Mobile Security 7.2 and Norton Mobile Security
http://www.symantec.com/docs/TECH202054
Please do update your thread with news if this has answered your question, or if tehre is anythign else you need to know!
All the best,
Mick