Does anyone remember a Noel's House Party (or similar show hosted by Noel) where a guy was tied to a wheel and sprayed with, what a remember to be, gray gunge? I could've sworn I saw it in the past week or so but I can't seem to find it. Am I crazy or does this clip actually exist?

It does exist, I know the one you mean.

Here you are, the action starts about 6:27

https://www.youtube.com/watch?v=Mlqrsg_MgHs

Wish there were still some forgotten/unseen nhp gungings as I love discovering new clips, but I believe they're all on YouTube now.

There is still some more from series 8 to be uploaded but I don't think there's anymore decent gungings from this series. I'm hoping to see the full GYOB series uploaded, it's been too long!