Bill Spedding says he has nothing to hide in William Tyrell investigations

The NSW grandfather whose home was raided in the search for William Tyrell says he understands why he is a person of interest - but maintains he had nothing to do with the boy's disappearance.

William "Bill" Spedding returned to his Bonny Hills property on the mid-north coast yesterday, four days after he was forced to shoulder the suspicion of an entire state as police combed the house for any links to the missing three-year-old.

"I had no involvement, I wasn't there on the day it occurred," Mr Spedding told The Sunday Telegraph. "We understand the investigation, we accept the investigation.

"I understand I was a person of interest because a few days before I was out there, a few days after his disappearance I was out there.

"I understand they are looking into that and I accept that fully."

Following William's disappearance from his grandmother's Kendall home on September 12 last year, Mr Spedding gave a 10-page statement to police as well as a DNA swab to assist with investigations.

He had been at the home, located 25km and a 20-minute drive from his own, days earlier to quote repairs and returned there a week later to finish the job.

Mr Spedding's wife, Margaret, has remained by her husband's side throughout the ordeal and was there yesterday as the pair began the clean-up at the home, mopping floors and putting away belongings.

"I have no worries about them going through everything because I knew they wouldn't find anything belonging to William," Mrs Spedding said.

Police spent two days searching the home, digging up the yard and draining a septic tank. No charges have been laid and police have insisted the search was one line of inquiry in the investigation.

Mr Spedding said he was certain the inquiry would clear his name.