Not to sound like a dick but then you didn't clean enough.
They don't live without living plant matter & their eggs are destroyed pretty easily with either harsh chemicals, H2O2, Essential oils or some kind of fogger.
They are honestly not that difficult to remove if you aren't doing some sort of perpetual grow where they can migrate from room to room.
If you really did clean well enough to get rid of them, then you brought them back in again, either on your clothes or bringing in plants from untrusted sources.
As far as getting them off of currently alive plants goes, since you're still in veg you can be pretty aggressive and your plants will recover. There are plenty of miticides out there, or if you wanna make your own, use Essential Oils (peppermint oil, rosemary oil, etc. if you go this route absolutely do it right before you turn out the lights and give the plants like 6 hours before turning them on again or you'll burn the crap out of things) mixed with some soap and potassium bicarbonate or sodium bicarbonate and literally wash each leaf, both top and bottom and all the stems, wipe down all table tops and surfaces they might have fallen on to. This will kill the mites and their eggs (which are typically on the bottom of leaves and why a lot of people fail to get rid of them).
You'll have to treat the plants a few times a week probably for multiple weeks if you really wanna get rid of them all, your plants will probably suffer a bit of deformation and burns and lose a lot of leaves, but it can be done.