Which Cleaning APPS do you need? Battery, Cache, RAM, Disk Clean, Virus and Ad Block

I am wondering what kind of APPs does your phone need to improve its various performances.

1) Battery saving (e.g. DU Battery)

2) Cache cleaners (e.g. App Cache Cleaner)

3) RAM clearners/Task Killers (e.g. Adanced Task Killer)

4) Disk Clean (e.g. Clean Master)

5) Virus Scanner (e.g. Avast Security)

6) Ad Blockers (e.g. Ad-Vanish Pro)

7) Other perfomrance app(s) that you suggest.

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