I have a list of data frames, if each df have multiple vars. All variables are characters. I found that there are some special characters (such as \x96) in some variables which prevent my codes to run. I have to convert them or remove them. Is it a smart way to remove them all at once?

currently I found iconv(lst[["df1"]]$var1, from ="UTF-8", to="ASCII", sub = "") can take care one variable in a df.