Remove residue and particulates, apply flux and clean any sensitive or fragile instruments or optics with swabs and applicators. Zoro sells standard cotton swabs, sterile swabs, fiber optic swabs, applicators and swabs for welding, and even tire swabs. Items vary by composition, shaft type, tip type, length, and other considerations. For more on welding and soldering supplies, see our plasma cutting accessories and soldering accessories.