Remove non-utf8 characters from string

Question

Im having a problem with removing non-utf8 characters from string, which are not displaying properly. Characters are like this 0x97 0x61 0x6C 0x6F (hex representation)

Answer 1

Slightly different to the question, but what I am doing is to use HtmlEncode(string),

pseudo code here

var encoded = HtmlEncode(string);
encoded = Regex.Replace(encoded, "&#\d+?;", "");
var result = HtmlDecode(encoded);

input and output

"Headlight\x007E Bracket, { Cafe Racer<> Style, Stainless Steel 中文呢？"
"Headlight~ Bracket, { Cafe Racer<> Style, Stainless Steel 中文呢？"

I know it's not perfect, but does the job for me.