These ads used to show green blobs falling across the screen. Here’s one:
Since this is about the commercial itself and not a factual question about the product, let’s move this to CS (from FQ).
I assume these were UK commercials?
Not necessarily, hair care products are advertised all around the world.
But you know if you were in the UK when you saw them, right?
Yes, let’s start with known things. Like, OP knew where they were when they saw those commercials.
FWIW, I don’t even recognize the brand, let alone the commercial (US here) but I’m pretty marketing-insensitive, so YMMV.
ETA: Wikipedia thinks it’s a UK brand. That may limit how strong a response @philipdalton gets here.
I remember I tried using it as eye drops, and it was a disaster. One vowel can make a big difference, people!
As far as I know, that shampoo was never sold or advertised in the US. Selsun Blue is the go-to medicated shampoo here.
Of course I was in the UK when I saw them.
The reference to “adverts” was a clue. 
Here’s an old one from the days of black & white TV.
The second ad in this commercial break:
To be accurate, that clip shows a golden-brown blob falling across the green.
My brother worked in advertising, and made a couple of TV adverts; no computer modelling in those days - that ‘blob’ of whatever colour would have been an analog blob of some kind, probably a real blob of liquid filmed closeup.
Notice how the tune featured in the background of these ads was almost identical to that used in the eighties:
