I have a bucket full of wheaties that were corroded with sand, couldnt read dates. Tried to clean them in the past but they came out too shiny.
Saw Mike's picture and asked how he cleaned them. 'Pea gravel', water, overnight in tumbler.
Grabbed a scoop of gravel sand from the beach, sifted for smaller stones, and here we have the results. Now I can look for that 14 'D" :