From my free space available, the 377.78 looks about right. I have been through the 3 manual cleaning apps already, but I still get the same result. Is something locked? Probably not; I get the same result after rebooting the phone.
So why can I not get the remaining ~370MB of savings?
The phone is a non-rooted Galaxy S4 with Jelly Bean.
I haven't an answer for you Hotaru, but maybe have a look at the items after scanning and see which location or app is hanging on to the space.
If you highlight and select an item in the results list it will give you a further list of the apps or processes under that particular section. Least ways it does on my phone.
With that info we might be able to help with an answer, or it may answer the question for you.
In the meantime one of the guys may have experience of this and have a solution for you.
I think you misunderstand what I suggested you do as we're not looking for errors or warnings ...
If you highlight and select an item in the results list it will give you a further list of the apps or processes under that particular section.
Highlight and select an item wasn't technically accurate as we're talking about touch screens here and not the usual computer mouse control way of selecting things.
Anyways, that out of the way, what I meant was that if you run a scan with CCleaner and then look at the results list it will give you an indication of the various locations which could be cleaned.
On my phone the top item in the list is usually the one hanging on to the largest mb's of space, and it's "cache".
The entry will also say how many apps are hanging onto that space ...
The example shows that 250 apps are using 758.96mb of space.
Before cleaning, if you then jab a sticky little finger onto that item (or any item), it will open a new list of the various apps which are individually using that space, and it will also tell you how many mb's each individual app is hanging onto.
Let us know what you find.
One other possibility, is that the CCleaner scan tells you how much space "can" be saved, not how much "will" be saved.
This is because there may be an item or items in the scan which are not ticked, and although they will be included in the "can be deleted" total amount, if not checked they won't be included in the cleaning result.
You may have to scroll down the original list to see all entries.
I tried taking screenshots but I just can't do it. I rarely get the button presses exactly right.
Analysis completed. 428.38MB can be saved.
Cache 6 apps, 900KB to clean
It is selected. I did see a list of 6 apps, and the total looks about right.
APK files 1 file 5.17MB to clean
It is selected. I did see a list of 1 .apk of that size.
Empty folders 15 folders
It is selected
Processes
User 30 processes System 54 processes
It is unselected
Call logs
161 calls
It is unselected
SMS
86 messages
It is unselected
Manual cleaning apps
Chrome
Opera
YouTube
Cleaning completed. 6.05MB has been saved!
This is the same kind of result I get every time, now with over 420MB that I can't recover. I know it can't be MMS. I have too little space for that. If I get a photo or video I immediately delete it or offload it to the PC and then delete it.
Hotaru, there are locations not mentioned in your list there, and I agree, screenshots are tricky to take.
In CCleaner, go to "Settings" using the icon top left and select "Custom Analyses" as shown at the top here ...
On the screen that opens you will see the various locations which can be selected to be "cleaned", as shown here ...
You'll see any locations not selected for cleaning, and one which comes to mind as shown in my screenshot is "downloaded files", which on my phone currently contains items I want to keep.
You may have an item (or items) not selected containing some if not all of the space you want to free.
You could also use a file manager to look for items being stored of which you are unaware.
And you have a lot of SMS messages there. I have no idea how much space they would take up. And YouTube if you use it can quickly build up a lot of MB.