Thanks for your advice above. Apologies for delay in reply but I did not receive any email notification.
I use the Chrome browser and occasionally Dolphin, the latter to give me access to Flash Player. I had decided to see what happened when cleaning and as you mentioned, there was no effect on my Bookmarks ... this was my major concern. Somewhere I also read that the Android cache should not be cleared because it can cause Apps to misoperate ... not sure if this is 'fact'?
Under the setting 'Customise Analyses' I only analysed cache/clipboard/Google Play Search History. I will have a look at the others listed on a one-by-one basis to start with, just to see what may or may not occur.