superclean
adjective
su·per·clean
ˌsü-pər-ˈklēn
: extremely clean
a superclean laboratory
… dust ruined semiconductors that had to be kept superclean.—Myron Magnet
Qualifying vehicles include superclean plug-in hybrids and possibly some hydrogen-fueled internal combustion engines.—Michael Cabantuan
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Merriam-Webster unabridged
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