http://www.courts.wa.gov/forms/?fa=forms.contribute&formID=45
Motion and Declaration to Seal Records of Juvenile Offender (MTAF)
Notice of Respondent’s Motion to Seal Records of Juvenile Offender
Order of Motion to Seal Records of Juvenile Offender
I did the whole process myself.
The juvenile court staff are actually pretty helpful when they find out you're just a law abiding adult trying to clear up the mistakes of your past.
If your adult conviction was a felony there's more you'd have to do.
RCW 9.41.047 governs adult restoration (as opposed to sealing.) The conditions are laid out in the law, and they are fairly simple.
From my understanding of the case law on the matter, once you meet the requirements, they HAVE to restore:
28012-4-II - State of Washington, Respondent v. Sigiel J. Swanson, Appellant File Date: 03/04/2003
"RCW 9.41.040(4) analysis
On its face, RCW 9.41.040(4) gives no discretion to the restoring
court once the enumerated, threshold requirements are met. In fact, the
only discretion that the statute contemplates belongs to the petitioning
individual, and that discretion concerns his decision to petition the court
in the first place. The provision states, 'the individual may petition a
court of record to have his or her right to possess a firearm restored.'
RCW 9.41.040(4) (emphasis added). This fact militates against a
construction of RCW 9.41.040(4) that gives the restoring court any
discretion to grant or deny the petition on grounds other than non-
compliance with the enumerated, threshold requirements."
"Because RCW 9.41.040(4) imposes no requirements other than the enumerated,
pre-petition requirements noted above, Swanson had no burden to show that
he is safe to own and possess guns. If the Legislature desired to impose
that burden, it certainly knew the language to employ, as evidenced by the
other statutes discussed above that impose such a burden. By the
Legislative omissions in the statute, we hold that RCW 9.41.040(4) imposes
only a ministerial duty9 on the court when the enumerated, threshold
requirements are met. Therefore, the trial court erred when it declined to
restore Swanson's firearm rights."