How do I clear tmp folders? - by: MadhuraBL

Hi Joffm, thanks for the quick response.
I meant, how do I clear the tmp files, do I just delete all the folders and files under /var/www/html/limesurvey/tmp folder?
Or keep the folder and delete only the files under those folder?
Example:
delete files under limesurvey/tmp/assets/ (keeping assets folder)
delete files under limesurvey/tmp/upload/cache (keeping cache folder)??

Thanks in advance