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Hi,
I had the same problem, ended up with a nice pile under the mop and none on it, but here is an easy solution I learnt.
Take about a 1" cube and place it in a water tight bag ( sandwich bag with a knot in the top will do) then place the sealed back in hot water and wait a few minutes. The compound should become like a thin paste as it melts, you can then apply this direct to your mop using something like a butter knife!! Careful how much you put on as its easy to go overboard!!
Then put mop aside and wait to dry.......
Hope this helps