the possible reduction of motor vehicle corrosion by regular washing, both with and without the addition of a corrosion inhibitor has been examined by two types of test. in laboratory tests, panels of painted and bare steel were exposed to intermittent salt spray at temperatures of 5 degrees c and 25 degrees c. results showed a very significant reduction in corrosion rates by regular separate application of the two components of the trrl inhibitor by low pressure spray. in field tests, three saloon cars are being subjected to various treatments in a regular programme of exposure to stone-chipping, salt-splashing, mud-splashing and road-driving. this has been in progress since january 1972 and already very substantial differences in the superficial corrosion of the bodywork due to treatment by the trrl inhibitor is apparent. straight washing without the use of inhibitor is much less effective. it is proposed to continue these tests until more extensive "inside-out" corrosion takes place in wings or sills. (a).

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