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For removing characters tr -d '$' < orig.csv > corrected.csv is more straightforward.

Trysed "s/\\${REMOVE_CHAR}//g"
and, btw, why don't you use $1 in lieu of $REMOVE_CHAR?

The sed suggestion with the escape before the variable expansion would work for special characters that need to be escaped so that they lose their special meaning, however there are also characters...