If it's been cleaned to death and still won't work on multiple systems, it's dead.
Huey is almost impossible to fix. You'd need to peel off the black piece and hope the issue is just broken trace from the connector to the epoxy blob. If the problem is inside the blob, forget it. Putting it back together is also a bitch, without the right kind of glue they'd either come apart again or warp the plastic and permanently ruin it.