I honestly don't recommend you to go sitelock security. Other than giving false positives and provide with some make-up scans, it seems to be a bad solution.
I'll recommend you to go sucuri, it has real time alerts.
About cleaning your website, I'm a real expert in site security, cleanup and web development, so I can help you better on this. If you have cpanel, it will be the best for me to check all the inner folders.
Contact me so I can start immediately. I'll be awaiting for your contact.