What a mess

I'm ashamed to ask, but does anyone know a good solution to getting cat urine out of particle board?  I found one solution of 1 qt. of 3% hydrogen peroxide

1/4 cup baking soda

1 teasp. dish liquid

We "tried", (with three successful litters, but it was just too much) breeding Persian cats and thus one ruined carpet. The carpet is out but the boarding still stinks..before I put anything down I have to get this smell out.  Any ideas?