How to get lien waiver from GC by paying full

[Priyank Singh]

Hi All, We are doing a home remodeling project, and our GC has done a poor job. When we called it out, he became rude and stopped responding to our message. I hired someone else to work on the project, and I am okay with paying him in full and just moving on to the next project.

I have already paid him ~300k, and ~40k of the last payment is remaining. I have asked for a lien waiver (the Property is in WA state), and he is not responding to me. I told him I would pay him in full if he provide a lien waiver,

I am wondering if we do not get a lien waiver, what are the options I have to get it, do I need to hire lawyer?