How to wipe cache and Dalvik cache

[d6000i]

Hi, I would like to "reset" my D6000 without loosing datas, so as I noticed here I have to wipe the cache and the Dalvik cache to reinstalls all my apps, so maybe it could fix some corruption issue. To do so I have booted into temproray TWRP but allways if I tried to wipe the Dalvik cache I´ve got the message that it is not possible because the device is crypted, which is the truth.
So how can I wipe cache and Dalvik cache on my device, which is crypted by build in Android 5.1 cryptography?
The decice is running 2.6 international, using Stevejc [Only registered and activated users can see links Click here to register] for setup.
Thank you for each ideas.

[Ninja^F.U.B.A.R.]

Have you tried using the stock recovery to wipe cache?

If that doesn't work, then can try to decrypt. Some phones allow, some don't.

If that doesn't work, then will need to wipe data / factory reset.

[stevejc]

See here : [Only registered and activated users can see links Click here to register]

[d6000i]

Hi, thank you both very much for quick help, will test and post my experience here