Can Ketchup Clean a Penny?

Squeaks loves collecting shiny pennies, but sometimes he finds one that's sort of grimy and dull. Lucky for him, Jessi knows a really cool science trick to clean up those tarnished pennies!
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SOURCES:
buggyandbuddy.c...
www.explorator...
playfullearning...
chemistry.stac...
cleaning.loveto...
applenetwork.us...
water.usgs.gov...