fix wpfastest cache without using wp-admin

I was using w3 total cache and I had a problem with my site and I was locked out of my wp-admin page, thankfully I found a step by step guide on how to uninstall w3total cache and all it’s associated files using only my ftp client. I moved on to wpfastest cache but now I’m having the same problems. At first the login plugin I installed was not working so I deleted the wpfastest cache plugin from the wp-cotent/plugins directory using an ftp client, That has made the problem worse, now my website does not even load completely and the login pages are just blank.

Can anyone help me with step-by-step instructions on all the files to alter and delete in order to completely remove the presence of wpfastest cache from my site?