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More likely, you'll have to scour off some excess solder with sandpaper or emery cloth before you can slip on a new fitting.
Berg discusses that "foam-based rock dust is not the answer to the 'caking' dilemma." He also discusses that "if the rock dust has caked, it will not scour off to catch up and extinguish the leading flame of the explosion." The same is true for so-called "foam-based" rock dust.
Scrape or scour off decaying food, which can attract disease, then scrub with a mild solution of bleach.
Using a steel wool soap pad, scour off any black flux tarnish on the seams.
If the rock dust is "caked" on the mine surface, the rock dust would not scour off the surface and participate in inerting the explosion.
Three ways to remove rust Pros: Cons: Grind, sand or scour off No pockmarks and a Dirty, dusty, hard the rust smooth finish prior work.
Don't move in and try to scour off stubborn dirt spots.