Restored a ground dug PIAT bomb a couple of years back....
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I used water in the nose cone, blocked the holes where it could leak out and froze it in a household freezer, then repeated until the dents had been pushed out by the ice expanding. Then a bath in citric acid to remove rust but not the paint. Came out not half bad.....
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Handy that you can still read the 'INERT' stencil!