Surface cleaning encompasses the preparatory and in-process removal of contaminants — including oils, greases, oxides, flux residues, and particulates — from aerospace metallic and composite substrates using aqueous alkaline or solvent-based degreasing, ultrasonic cleaning, vapour degreasing, and plasma or UV-ozone treatment, ensuring surfaces meet cleanliness standards prior to bonding, coating, or inspection per AMS and ASTM specifications.
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