stay away from the BG snake oils. They cause all sorts of problems and despite what they claim, BG are a bunch of liars and will not stand behind any kind of warranty. When I worked for the dealership they used my corolla for some training on how to use their stuff when they were first bringing in the BG stuff. Corolla didn't have high mileage and had absolutely nothing wrong with it. They smoked my cat converter and then claimed it was my fault (they did the service not me). Then refused to pay the $1k for a new cat converter. That was the "top engine cleaner" and mist stuff they spray in to clean the TB. Then another guy DESTROYED a transmission using their snake oil and a trans flush in a Sequoia (which is an otherwise bulletproof transmission). Another guy did a trans flush on a 4runner (another bulletproof transmission) and 2 days later the truck returned on a flat bed because it was slipping so bad it wouldn't drive under its own power.
BG SUCKS! It's all marketing, gimmick, and the techs LOVE to swear by it not because "it works" but because they put these little plastic pucks inside the cans. Supposed to collect and save all the pucks. At the end of the week the BG guy comes and gives the techs like 50 cents for each "puck". For the guys that "swear by" the BG crap it's only because they upsell that junk on every car they touch to collect the pucks and get an extra $30-40 when the BG guy comes around.
And they had this "super special chemical" that shows how strong the detergent is in their cleaners. They put in a couple drops and it turns purple, then however many drops it takes to turn it back to clear shows how "strong" the detergent is. They showed walmart brands, 1 or 2 drops back to clear. some others took 5 or 6 drops to go back to clear. They demonstrated how "amazing" their stuff is because it took like 20 drops to turn it back to clear. So I called the guy out and used some Toyota brand EFI cleaner. 20, 30, 40 drops it was still dark purple. He dumped in his entire bottle of magic drops and it still wasn't clear. It was lighter purple but nowhere near being clear again lol. That guy never spoke to me again after that, he went out of his way to pretend I didn't exist.
Anyway, I could go on and on with real life examples of how BG sucks but i'll end my little rant lol. As for the clutch, if it's not slipping I wouldn't worry about it much. I've got over 250k on my original clutch and it still works like new. but I don't abuse it or try to pretend it's not a race car either. But if you do replace it I'd just buy a new flywheel they're not that expensive and start with everything new. Generally new clutches and used flywheels have about a 50/50 chance of either working perfect or chattering.