Send M&M notice to GC and to homeowner.
Send it certified, return receipt requested. There's some specific wording you need to have in it but when the homeowner has to go to the Post Office to sign for a letter, he'll know you mean business.
If the homeowner knows you've done work in his house you should be good to lien it. There are very specific timing rules for notices so be carefull on not letting the timeline slide. GC's go to school to learn how to delay payments till it's too late or u get too busy to spend time to collect.
