Nolan helmets and 'pinloc' anti fog stuff

OK I have a Nolan N102. When I got it the anti fog insert wasn't with it
but I was given one and it was fitted for me recently. Anyway all's been
great - no fog where the insert is.

Anyway this arvo I took the opportunity to clean it all - I took the
insert out and washed it all gently in cool water dried it all off (like
I do with the normal visor and VPS) then reassembled it.

Anyway less than 1km from the house later on I fogged up.

It's been on the kitchen table half an hour airing but I don't feel like
putting the insert back in if there's no point, reassembling it stresses
me out for some reason

The 'insert' as I call it anyway is a small clear sheet of what appears
to be the same plastic as the main visor is made of, that sits just
inside the main clear visor and locks on the two small pins at the edges
of your peripheral vision, covering most of the inside of the clear
visor. Essentially it double-glazes the visor I guess. I don't mean the
shaded 'VPS' that sits outside the main clear visor.

My question boils down to - does that insert have some sort of coating
I've washed off and I may as well order a new one, or does it just need
a 'thorough wipe down' and reassembling ?