Are there any cache you CANT delete?   Invisible files!?!?!

My MBP is getting pretty full so i downloaded Whatsize to see where everythings at. i found a cache folder that was about a gig large, so i moved it to the trash. and then when i tried to empty the trash it said that a file was in use (one from the cache file) so i stopped, and did not delete it. Is there any caches you cant delete, something that will effect the performance of my computer? or is it ok to go ahead an delete and open up the space?
One other issue is when i ran Whatsize it located a file called "Private" with such things as "ver" "ect"" "temp" in it. it is pretty large. but i can find it anywhere on the hard drive. i even tried to spotlight it, but nothing of the such came up. i have no idea what it is. i kinda want to delete it, but im not going to if i dont know what it is. any help would be appreciated. thanks

Caches which you can't delete should be kept in the cache folder. There are programs open all the time unless you boot into single user mode or connect to another Mac with target disk mode. I would not mess with the caches too much, as some are always being written to. Deleting a file which is being written to can cause data corruption.
Best to backup your data and only delete files from those folders which are safe which I've outlined:
http://www.macmaps.com/safetodeleteormove.html

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