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Hi all,

Questions about the smoke cleaning label/sticker under the cab roof of engine with a heater type smoke generator.

There seems to be two different wordings, see my attached photo.  One that says vaseline and one that says petroleum jelly, with the petroleum one being the most common one seen.

Does anyone have any info about the two, perhaps the time frame on when one or the other was used?

Thanks much

IMG_2978

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