If pm is tour toughest issue, hope you don't get mites. Pm is super easy, as long as your diligent. I'd never toss out clones with pm.
I've had mites. They do suck but 2 bottles of "The Bomb" for 6 plants in an 8x10 room and I lucked out. I haven't seen a mite in over a year.
Fungus gnats are tougher than mites IMO. You think you got them all and then you see another flyer. Damn.It took 3 runs before I killed them all!
As for PM It's one thing to nurse plants in flower that had buds, but to do clones knowing they are contaminated is just looking to contaminate your entire crop ! The only thing I would do with PM buds (now that I know it's in the tissue) is have my caregiver make BTO. I know there is stuff out there to fight it ie,
Hydrogen Peroxide,milk
Greencure to name a few but it's only a band aid . You are not killing PM without killing the plant IMO.