Cannot Delete Content Of WebCache Log File

I have noticed that a random .log file will appear in

C:Users"username"AppDataLocalMicrosoftWindowsWebCache folder.

The file usually has a name similar to V10009C.log. When this file first appeared I opened it with notepad and it was a bunch of jibberish (i.e. REDIRECTURL ), but within all that gibberish I was able to note that it was showing files I had recently accessed (i.e., V i s i t e d : "username"@ f i l e : / / / C : / W i n d o w s / S y s t e m / N e w % 2 0 f o l d e r/filename.extension).

I was able to "securely" delete the file. However, a few days later I noticed a new file appeared with a similar name. When I looked through that file it seemed to have all the previous information from the previous file I deleted and information on files I had accessed since deleting the old file. What this file is and how it keeps adding information of files accessed? I really do not want to have this file reach some absurd file size as it seems to be retaining / recovering information even after deletion. Also, there is a file in the same folder called WebCacheV01.dat that has grown to 33 mb. Can't see its contents and I can't delete.