What should I do if the precision metal shrapnel is difficult to clean? 'Hardware'

What should I do if the precision metal shrapnel is difficult to clean? Do the following three points: 1. Use a soft cloth or paper to wipe the fat, oil, and lubricating oil pollution of the precision hardware shrapnel, and then use a neutral detergent or ammonia solution or special scrubbing drugs to scrub; fingerprints, use alcohol or Organic solvents (ether, benzene), wipe dry with a soft cloth and then wash with water; bleach and acid are attached and rinse with water immediately, soak in ammonia or neutral carbonated soda aqueous solution, and then wash with neutral detergent or warm water . 2. The welding of the hardware shrapnel is heated and discolored, wash it with 10% nitric acid or hydrofluoric acid solution, then neutralize it with ammonia water, carbonated soda light solution, and then wash the stainless steel spring with water--specially used for washing medicine; organic carbide adheres and soaks in A hot neutral detergent or ammonia solution is then used to scrub with a weak abrasive detergent. 3. For labels and films, use warm water and weak scrubbing agent to scrub; for dust and easy to remove scales, use pan rice, weak lotion or warm water to scrub; binder component, use alcohol or organic solution; surface contamination of precision metal shrapnel Use nitric acid (10%) or abrasive scrubbing agent to wash away the rust caused by substances-use special scrubbing chemicals to cause excessive rainbow patterns, use scrubbing agents or oils, and use warm water scrubbing agents when scrubbing