This should work
gsub('u009c','','u009cYes yes for ever for ever the boys ')
"Yes yes for ever for ever the boys "
Here 009c is the hexadecimal number of unicode. You must always specify 4 hexadecimal digits.
If you have many , one solution is to separate them by a pipe:
gsub('u009c|u00F0','','u009cYes yes u00F0for ever for ever the boys and the girls')
"Yes yes for ever for ever the boys and the girls"
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