I admit, I borrowed this from How to fix strange characters in MySQL database â Vinh Pham. But I also added a few more that were missing;
update <table> set <field> = replace(<field>, 'ââ¬â¢', '\'');
update <table> set <field> = replace(<field>, 'ââ¬Â¦', '…');
update <table> set <field> = replace(<field>, 'ââ¬â', '-');
update <table> set <field> = replace(<field>, 'ââ¬Å', '"');
update <table> set <field> = replace(<field>, 'ââ¬Â', '"');
update <table> set <field> = replace(<field>, 'ââ¬Ë', '\'');
update <table> set <field> = replace(<field>, 'ââ¬Â¢', '-');
update <table> set <field> = replace(<field>, 'ââ¬Â¡', 'c');
update <table> set <field> = replace(<field>, 'ââ¢', '™');
update <table> set <field> = replace(<field>, 'î', '®');
Hopefully this helps someone (probably even me) sometime down the road!

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