{HEAD ~ The method} typically involves dissolving {TAIL ~ polyisobutylene} in a solvent such as hexane to form a tackifier solution, soaking the substrate in the tackifier to produce a preform, and then drying the preform to produce the cleaning medium 
typically involves dissolving
{ HEAD ~ The method } typically involves dissolving { TAIL ~ polyisobutylene } in a solvent such as hexane to form a tackifier solution , soaking the substrate in the tackifier to produce a preform , and then drying the preform to produce the cleaning medium
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH