TM 10-3930-669-34 2-17.  GENERAL CLEANING INSTRUCTIONS (CONT.). WARNING Compressed  air  used  for  cleaning  purposes  will  not  exceed  30  psi  (207  kPa).    Use  only  with effective chip guarding and personal protective equipment (goggles/shield, gloves, etc.). b. Removing Deposits.  Soak parts in dry-cleaning solvent and wash away deposits by flushing or spraying.  When necessary,  brush  with  a  soft-bristle  brush  (not  wire)  moistened  in  solvent.    Use  compressed  air  to  dry  parts,  except bearings, after cleaning.  Bearings must drip and air dry. c. Tools.  Do not use wire brushes, abrasive wheels, or compounds to clean parts unless specifically approved in the detailed procedures.  Parts may be scratched or altered and may be weakened. d. Ball and Roller Bearings.  When cleaning ball or roller bearings, place them in a basket and suspend them in a container  of  dry-cleaning  solvent.    If  needed,  use  a  brush  to  remove  caked  grease,  chips,  etc.    Avoid  rotating  bearing before solid particles are removed to prevent damage to precision bearing surfaces.  When bearings have been cleaned, coat them lightly with lubricating oil to remove solvent. CAUTION Do not clean tires, lubricant seals, rubber hoses, or electrical components with solvent mixture. e. Rubber Parts.  Do not clean preformed packings or rubber parts in dry-cleaning solvent.  Wipe parts clean with a dry, cleaning cloth. WARNING Steam  cleaning  creates  hazardous  noise  levels  and  severe  burn  potential.    Eye,  skin,  and  ear protection are required.  Failure to comply may result in injury to personnel. f. Exterior  Parts.    Steam  clean  all  exterior  parts  thoroughly  before  removing.    This  will  make  inspection  and disassembly easier. WARNING Solvents  used  with  a  spray  gun  must  be  used  in  a  spray  booth  with  filter.    Face  shield  must  be used by personnel operating spray gun.  Failure to comply may result in injury to personnel. g. Engine,  Cab,  and  Body.    Use  a  spray  gun  and  solvent  mixture  for  cleaning  exterior  of  engine,  cab,  and  body. Allow mixture to remain on item for ten minutes before rinsing.  Rinse with hot water under 80 to 120 pounds of pressure, if available.  An ordinary garden hose with nozzle may be used if other equipment is not available.  Rinse thoroughly. 2-90