Sharing a very helpful solution from Bannager Bong
on this Google Docs Editor Help Forum thread. Made a slight modification to the function so that it accepts arguments for the find, replace values and then added a range argument so that the function can target a specific region. Even so, this method is extremely slow (my sheets have 5k rows).
function Cleanup12m() {
var spreadsheet = SpreadsheetApp.getActive();
//fandr(",", "");
//fandr("\"","");
fandr("�","",spreadsheet.getRange('BA:BA')); //uses specific range
};
function fandr(find, repl) {
var r=SpreadsheetApp.getActiveSheet().getDataRange();
var rws=r.getNumRows();
var cls=r.getNumColumns();
var i,j,a,find,repl;
//find="abc";
//repl="xyz";
for (i=1;i<=rws;i++) {
for (j=1;j<=cls;j++) {
a=r.getCell(i, j).getValue();
if (r.getCell(i,j).getFormula()) {continue;}
//if (a==find) { r.getCell(i, j).setValue(repl);}
try {
a=a.replace(find,repl);
r.getCell(i, j).setValue(a);
}
catch (err) {continue;}
}
}
};
//Revised to apply to a selected range
function fandr(find, repl, range) {
var r= range;//SpreadsheetApp.getActiveSheet().getDataRange();
var rws=r.getNumRows();
var cls=r.getNumColumns();
var i,j,a,find,repl;
//find="abc";
//repl="xyz";
for (i=1;i<=rws;i++) {
for (j=1;j<=cls;j++) {
a=r.getCell(i, j).getValue();
if (r.getCell(i,j).getFormula()) {continue;}
//if (a==find) { r.getCell(i, j).setValue(repl);}
try {
a=a.replace(find,repl);
r.getCell(i, j).setValue(a);
}
catch (err) {continue;}
}
}
};