Just call a thorough “pest control agency.” Good opportunity for some to expand their business.
There IS one guy in California who started a business getting rid of squatters (heard him on my local radio show) - I’m sure he isn’t cheap.
His mother moved into assisted living and squatters moved into the home - cops wouldn’t do a thing. He had his mother lease the home to him and he moved right in with the squatters (who called the cops on him) - he produced a legitimate lease for the house, but the cops wouldn’t remove the squatters.
He said he set about to make their lives absolute hell until they left - said it usually happens within a day. He now has a team that does this - I’m sure he charges a lot of money b/c of the risk involved.