Is the Working Families Party finally cleaning up its act?

We’ll believe it when it happens.

Nevertheless, it was gratifying to see the far-left party agree in a Staten Island courtroom last week to cut loose its ethically dubious corporate arm — first spotlighted by The Post — which had allegedly been acting as a funnel for illegal union donations to campaigns.

Under a legal settlement with voters represented by former Giuliani aide Randy Mastro, the WFP agreed to install an independent board of directors for the company, Data & Field Services, which it had set up to run its powerful campaign operation — and submit to strict oversight of all its future contracts.

It also agreed to bill Councilwoman Debi Rose (D-SI) an extra $13,500 for services it rendered during her two campaigns last year.

That’s a revealing concession: Mastro had claimed, as numerous reports in The Post and elsewhere indicated, that DFS was radically undercharging WFP-favored candidates like Rose for its services — in what amounted to massive, under-the-table, in-kind contributions.

The ultimate source of that cash: the unions that control and fund the WFP.

Mastro says the actual undercharge was tens of thousands of dollars more — though the dough Rose must now cough up will likely still put her in violation of the Campaign Finance Board’s spending caps.

Still, don’t expect the WFP to automatically start playing fair.

Sure, the court retains some oversight of the restructuring, but the squidlike party — itself an offshoot of legally challenged lefties at ACORN — is expert at growing tentacles to stay one step ahead of the law.

Thus, apparently, DFS.

Besides, one thing that certainly hasn’t changed is the arrogance of New York’s all-powerful unions, which take it on faith that the rules don’t apply to them.

So what are they cooking up next?

Stay tuned . . .