Cell B3 contains a few odd characters and the formula in C3 shows the ANSI equivalent of each character in B3. If you are interested in how I built the formula, read this: How to identify characters in a cell value

For example, 160 is an HTML space character that the TRIM and CLEAN function can't remove. You can remove a single character using the SUBSTITUTE function, however, if your cell contains multiple unwanted characters the following formula will remove specific characters.

Array formula in cell B10:

The characters I want to remove are in B6:B7 in ANSI code format. The formula in cell C10 shows that 160 and 143 are now gone in cell B10.

Explaining formula in cell B10

The INDEX function and the LEN function allows you to create a cell reference containing as many rows as there are characters in cell B3.

$A$1:INDEX($A$1:$A$1000, LEN(B3))

becomes

$A$1:INDEX($A$1:$A$1000, 7) and returns $A$1:$A$7.

The ROW function then creates an array from 1 to the number of characters in cell C3.

ROW($A$1:INDEX($A$1:$A$1000, LEN(B3)))

becomes

ROW($A$1:$A$7) and returns {1;2;3;4;5;6;7}

Now it is time for the MID function to split each character in cell C3 to an array.

MID(B3, ROW($A$1:INDEX($A$1:$A$1000, LEN(B3))), 1)

becomes

MID(B3, {1;2;3;4;5;6;7}) and returns {" ";"5";"4";" ";"A";"";"A"}

The CODE function allows you to convert a character to ANSI code (PC). We are using an array so the function will convert all characters at the same time.

CODE(MID(B3, ROW($A$1:INDEX($A$1:$A$1000, LEN(B3))), 1))

becomes

CODE({" ";"5";"4";" ";"A";"";"A"}) and returns {160;53;52;32;65;143;65}

The COUNTIF function counts how many times 160 and 143 are found in the array.

COUNTIF(B6:B7, CODE(MID(B3, ROW($A$1:INDEX($A$1:$A$1000, LEN(B3))), 1)))

becomes

COUNTIF({160;143},  {160;53;52;32;65;143;65}) and returns {1;0;0;0;0;1;0}

The IF function checks the logical expression and returns a blank value if TRUE and the charcater if FALSE. The IF function evaluates TRUE as 1 and FALSE as 0 (zero).

IF(COUNTIF(B6:B7, CODE(MID(B3, ROW($A$1:INDEX($A$1:$A$1000, LEN(B3))), 1))), "", MID(B3, ROW($A$1:INDEX($A$1:$A$1000, LEN(B3))), 1))

becomes

IF({1;0;0;0;0;1;0},"",{" ";"5";"4";" ";"A";"";"A"}) and returns {"";"5";"4";" ";"A";"";"A"}.

Lastly, the TEXTJOIN function concatenates the remaining characters in the array ignoring blank values.

TEXTJOIN(, TRUE, IF(COUNTIF(B6:B7, CODE(MID(B3, ROW($A$1:INDEX($A$1:$A$1000, LEN(B3))), 1))), "", MID(B3, ROW($A$1:INDEX($A$1:$A$1000, LEN(B3))), 1)))

becomes

TEXTJOIN(, TRUE, {"";"5";"4";" ";"A";"";"A"}) and returns 54 AA in cell B10.

Download Excel *.xlsx file

How to remove unwanted characters from cell value.xlsx