Initial cleaning shouldn't be ignored. And you need something that will remove the machine oil used during manufacture or it will taint your first brews. "Oxy" type cleaners will
not remove mineral oil and will be relying on the warm water doing the job (probably unsatisfactorily). PBW might be okay (I believe it contains a degreasing agent, but not a lot), The GF cleaning agent
ought to clean it okay. I purchased some tri-sodium phosphate (TSP, off eBay), others have used alcohols and rinsed well (industrial alcohol doesn't want to make it into your beer - it's poisonous!).
Before using TSP the taint that was very evident during fermentation but didn't carry over to the keg, so perhaps my GF initial cleaning (a boil "dry run" - figure of speech, it was pretty wet!) was adequate and the problem only existed in the sampling/racking valve of the GF conical; but as you're not using the GF conical that's not a problem, but I have seen a post by someone who didn't adequately clean their new GF brew system and the resultant brew sounded pretty yucky.
~~~footnote~~~
There's been some concern about a removed post from this thread. But if
@Chippy_Tea perhaps misinterpreted the post, you can guarantee a number of users also misinterpreted the post. Better it is removed and explained better by the poster if legitimate (as I think has happened?) before it could do more damage. Before Xmas I had a thread seemingly inexplicably locked, but with hind sight although the protagonists (me and another) had sorted their differences, a rabble was gathering in the wings! Being a forum administrator is a tricky job I'm sure, everyone should help them by writing replies carefully that can't be misinterpreted.
Says me, who having started using forums got a thread locked for bad behaviour within a week of joining. Not this forum (and the other protagonist was none other than the late Graham Wheeler!).
One thing, if you think my replies are long-winded, you have no memory of GW's replies!